Question: (CNN)A pilot and CEO of a health research firm, who survived a 2010 mishap involving a plane in Gaithersburg, Maryland, was among six people killed in Gaithersburg Monday when a twin-engine plane crashed into a subdivision. Marie Gemmell and her sons, Cole, 3, and Devon, an infant, were found in the second-floor bathroom of one of the houses struck by the plane, said Pete Piringer, the public information officer for Montgomery County Fire and Rescue. Michael Rosenberg, CEO and founder of a North Carolina clinical development company called Health Decisions, was identified as one of the people on the airplane, according to a statement from the company. The flight originated in Chapel Hill, North Carolina, close to the company's headquarters in Durham. The National Transportation Safety Board has not said who piloted the plane, but Rosenberg was certified to fly that type of aircraft, according to Federal Aviation Administration records. The crash occurred at about 10:44 a.m. Monday as the twin-engine Embraer EMB-500/Phenom 100 made an instrument approach to Montgomery County Airport, Robert Sumwalt of the NTSB said at a news conference near the wreckage. FAA records show that Rosenberg piloted a small plane that left the runway during a landing at the same airport on March 1, 2010. The plane skidded 100 feet off the runway and came to rest in trees, nose down in the mud, the NTSB report says. There was one minor injury, the report added. In Monday's incident, the plane went down about a mile from the airport, hitting three houses in all. The airport is about 25 miles northwest of Washington. Witness Fred Pedreira, 67, told CNN affiliate WJLA the plane appeared to be out of control when it crashed. "This guy, when I saw him, for a fast jet with the wheels down, I said, 'I think he's coming in too low,'" said Pedreira, who lives near the crash scene. "Then he was 90 degrees -- sideways -- and then he went belly-up into the house and it was a ball of fire. It was terrible." In describing the crash site, Sumwalt said, "The main part of fuselage is rested up against the second house, with the tail of the airplane actually at the front door of that house, and then finally it appears that one of the wings was catapulted over into the third house where the majority of the fire damage occurred. So the aircraft wreckage itself is really in two main areas, but it damaged three houses." Montgomery County Police Chief Chris Manger said Gemmell's husband and the couple's 5-year-old child were not home at the time. "This a tragic loss for the Montgomery County community," Fire Chief Steven Lohr said at the news conference. On Monday, Sumwalt said the plane's "black box" had been recovered from the wreckage. He said the device contained the cockpit voice recorder and flight data recorder. "It has been rushed to our headquarters in Washington, D.C., where... investigators in our labs will begin this evening downloading the data," he said. There was no "mayday" call from the plane, and the first sign of trouble was a radio call from someone who saw the crash. "I think that Phenom just came up short," the call said, according to LiveATC.net. "What? Holy [deleted]!" someone else replied on the frequency. Later, someone says, "There's nothing left of that house." A woman who lives near the scene of the plane crash told CNN affiliate WUSA she might have heard victims calling for help. "I heard screams and somebody else beside me heard screams, but we're not sure if it was from inside the house or behind the house. ... We're not completely sure it came from inside the house, but we did hear screams," the woman said. She also described how she first became aware that something was terribly wrong. "At first I heard a big sputtering sound. By the time we rushed over here, you see a plane hit the side of the house and then crash right down and there was a big explosion," the woman said. She also says she heard a loud booming sound. "By then, the flames were just so high and then it was a big mushroom effect of smoke and it just burst into flames." CNN's Deanna Hackney, Leslie Holland and Rene Marsh contributed to this story.

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A pilot named Michael Rosenberg crashed at the same airport in 2010. A woman and her two young sons were found dead inside the house, authorities say. The "black box" has been recovered and its data is being analyzed, NTSB said.

North Korea says the remains of thousands of American soldiers killed during the Korean War are being moved due to construction projects and flood damage. The United States suspended efforts to recover war remains in North Korea over the country's plans to launch a long-range rocket in 2012. About 8,000 U.S. service members are listed as missing from the 1950-53 war. An unidentified North Korean military spokesman said in a statement Monday that American soldiers' remains are 'left here and there uncared and carried away en masse' because of building projects, land reorganization and flood damage. Analysts say the North's statement is aimed at pressuring Washington to resume the recovery project as a way to get money and improve ties with the U.S. Scroll down for video. Where's Kim? North Korea's leader Kim Jong-un, 32, hasn't been seen in nearly 40 days, prompting much speculation about the stability of his regieme. North Korean leaders meet in Pyongyang. Meanwhile, South Korea on Monday said it had warned North Korea of a 'strong' response if it provoked an incident similar to one last week that sparked an exchange of machine gun fire across their border. The warning came as South Korean President Park Geun-hye reiterated on Monday her commitment to engage with the North, despite what she called 'the dual nature' of ties, saying the 'door was always open to dialogue.' South Korea said the North Korean firing was a 'provocative act' that had violated the truce suspending their 1950-53 war and the complaint was reiterated in a notice the South sent the North late on Sunday. 'It is a stern warning of a strong response in the event of further provocation,' South Korean Defense Ministry spokesman Kim Min-seok told a briefing. The exchange of fire on Friday began after North Korea fired shots at balloons carrying leaflets sent towards the North by South Korean activists critical of the North's leadership. North Korea has long criticised the leaflet drops as provocative and it has threatened to respond to them with force. But before Friday, it had never done so. No one was hurt in the firing. North Korea's state media said on Saturday that expected talks with the South to try to improve ties were in danger of being cancelled because authorities in South Korea had allowed the activists to float their balloons. South Korean President Park Geun-hye reiterated Monday her commitment to engage with the North, despite what she called 'the dual nature' of ties, saying the 'door was always open to dialogue' 'The leaflet-scattering operation ... was a premeditated and deliberate politically motivated provocation perpetrated under the backstage wire-pulling of the U.S. and the South Korean authorities,' the North's KCNA news agency said. North Korea sent a high-level delegation on a surprise visit to the South on Oct. 4 and the two sides agreed to reopen dialogue, which has been stalled since February, late this month or early next. Private groups in the South, often led by defectors from the North, cite their constitutional freedom of expression in releasing their balloons. The South's Unification Ministry, which handles relations with the North, repeated on Monday it had no legal justification to stop the leaflet drops but said authorities may try to step in to prevent them on the basis of ensuring public safety. North Korean defectors prepare to send balloons carrying propaganda leaflets condemning North Korean leader Kim Jong- Un.

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Answer: The move is seen as a way of pressuring Washington to resume a recovery project suspended in 2012 over North Korean plans to launch a new rocket. South Korea says it has warned the North of a strong response if it provoked another incident like last week, which resulted in gunfire. Leaders in the South says the firing was a 'provocative act' that violated the truce suspending their 1950-53 war.