Paris (AFP) - Unidentified drones flew over Paris for a second night in a row, police said Wednesday, in the latest mystery appearance of unmanned aircraft over the French capital at a time of high security. 
 
 The sightings follow a series of drone spottings at French atomic plants last year and, more recently over the presidential palace and a bay in Brittany that houses nuclear submarines. 
 
 Authorities have been left scratching their heads as they remain unable to catch any of the operators or determine whether the flyovers are the work of pranksters, tourists or something more malicious. 
 
 Flying drones over the French capital is banned by law, and the latest sightings come at a time of heightened vigilance following last month's jihadist attacks. 
 
 A police source told AFP that witnesses and security forces reported at least five sightings overnight Tuesday to Wednesday over central Paris -- that may have been the same drone or several. 
 
 The tiny aircraft were spotted near the US embassy, not far from the Invalides military museum, the Eiffel Tower and several major thoroughfares leading in and out of the French capital, the source added. 
 
 Police had already been trying to find out who was behind the appearance of an estimated five separate drone flights over similar areas of Paris the previous night. 
 
 - Probe underway - 
 
 View gallery France has launched a one-million-euro programme aimed at detecting and intercepting pilotless drone … 
 
 "People should not be worried but vigilant, it's an issue which is taken very seriously," government spokesman Stephane Le Foll told reporters, adding a probe was under way to find the operators. 
 
 He said drone flyovers had taken place in other countries such as Germany, where a small unmanned aircraft operated by activists denouncing police surveillance landed just several metres away from Chancellor Angela Merkel during a 2013 campaign event. 
 
 And last month, a small drone crash-landed on the grounds of the White House, prompting a security lockdown. 
 
 French authorities were first alerted to mystery drone flyovers in October, when state-run power company EDF filed a complaint with police after detecting the small aerial vehicles zipping over seven atomic plants. 
 
 The sightings continued into November, and altogether some 20 flyovers took place over nuclear plants. Their operators were never found. 
 
 In October, a 24-year-old Israeli tourist spent a night in jail and was slapped with a 400-euro ($450) fine for flying a drone above the Notre Dame cathedral. 
 
 Then on January 20, a pilotless aircraft briefly went over the presidential palace in Paris, not long after jihadist attacks that left 17 people dead and put the country on high alert. 
 
 And at the end of January, small drones were also spotted near a bay in Brittany that houses four nuclear submarines -- one of the most protected sites in the country. 
 
 - 'Eye on the sky' - 
 
 With many more police and troops out on the streets of Paris following the shootings, drone sightings may be more likely. 
 
 "Many sensitive sites are protected and from now on we are asking law enforcement to have an eye on the sky as well," said a police source. 
 
 French law prohibits small civilian drones from sensitive areas such as nuclear facilities, which are protected by a no-fly zone that spans a 2.5-kilometre (1.6-mile) radius and a height of 1,000 metres. 
 
 Faced with the difficulty of intercepting drones and their operators, France has launched a one-million-euro programme aimed at developing ways of detecting them. 
 
 The pilotless aircraft come in all shapes and sizes, and have a variety of uses, from military applications to surveillance, filmmaking, sports, disaster relief and scientific research. 
 
 The most basic unmanned aircraft are radio-controlled by someone nearby, but other more sophisticated models can be pre-programmed and the operator can be miles away. ||||| Image copyright Reuters Image caption Some of the latest sightings were again around the Invalides military museum 
 
 Drones have appeared over landmarks in central Paris for the second night running and police are no closer to knowing who is operating them. 
 
 There were five sightings between 23:00 on Tuesday and 02:00 (01:00 GMT) on Wednesday, French media report. 
 
 Up to three drones were seen near the Invalides military museum, Place de la Concorde and two of the old city gates. 
 
 Flying drones over Paris at night is illegal and daytime flights require authorisation from the city. 
 
 Five drones were seen the previous night in similar areas, including the Eiffel Tower and above the US embassy, close to Place de la Concorde. 
 
 However, some of the latest drone flights have been captured on film and will be analysed by a 10-strong team of investigators set up after the first incidents. 
 
 The new sightings were also on the fringes of central Paris, at the key transport gates of Porte de Clignancourt in the north and Porte de Saint-Cloud in the south-west. 
 
 "There's no need to worry, but we should be vigilant. It's a subject being taken very seriously," said government spokesman Stephane Le Foll. Part of the problem was that they were so easy to operate, he said, but everything was being done to catch those involved. 
 
 Small drones are inexpensive but their appearance in recent months over sensitive locations has worried French authorities. 
 
 It is against the law for any aircraft to fly lower than 6,000m (19,700ft) over central Paris. Flying any aircraft under that ceiling - including drones, police helicopters and air ambulances - requires permission from city authorities. 
 
 Flying a drone at night is banned completely. 
 
 Analysis: Hugh Schofield, Paris correspondent 
 
 The security threat from these drones is minimal. Bird's-eye images of Paris landmarks are available online in far higher quality than anything these devices could produce. And small, shop-bought drones are not strong enough to deliver a significant payload of explosives. 
 
 The more likely risk from these drones is that one might get out of control and crash on to a street, injuring a pedestrian or causing a car accident. That is the main reason why flying drones is banned over populated areas of France. 
 
 The police cannot afford to ignore these overflights however. They are probably the work of drone enthusiasts giving the authorities the run-around, but not certainly. It could also be an organised group - eco-warriors or jihadists, for example - testing out how the security forces respond to drones. 
 
 Security at key sites in Paris was tightened last month after the murders of 17 people by Islamist gunmen and French officials say that was the main reason the drones were spotted. 
 
 Last month a drone was seen over the Elysee Palace, home of President Francois Hollande. 
 
 In October, a 24-year-old Israeli tourist was fined €400 (£293; $453) and spent a night in jail after flying a drone over the city's historic Hotel Dieu hospital and a police station. 
 
 Drones were also spotted flying over at least 13 nuclear power plants in France between October 2014 and January 2015. 
 
 Those flights were thought to be the work of environmental activists but no group claimed responsibility. 
 
 The latest incidents involve a group that is not lacking in money, according to aviation security specialist Christophe Naudin. 
 
 Those behind them were seeking to "defy the power of the state", he told RTL radio, and trying to damage the French sense of security. 
 
 Drones present a problem for authorities in built-up areas, in that shooting them down could endanger the public. It is possible to jam GPS or radio signals guiding them.
– The City of Lights is abuzz a second day over mysterious drones that flew over Paris landmarks again last night, the BBC reports. Five drones were spotted in a three-hour period last night at locations like a military museum, city gates, and Place de la Concorde. Authorities plan to review footage of the devices to learn more about them. "Is it a game? Scouting for future operations? The investigation will show us," a police chief tells AFP. A BBC correspondent says the biggest direct danger from the drones would be a possible crash, which could hurt people on the street. Political or religious extremists might also be using the machines simply to find out how officials handle them. But the more likely explanation, according to the correspondent, is that recreational users are trying to prank officials. Recent months have also seen drones flown over nuclear plants, possibly by environmental activists, the BBC notes. In January, a drone soared over the presidential palace; the same month, drones appeared near a site in Brittany that holds nuclear submarines, AFP reports.