WASHINGTON (AP) — For the second time in three days, the White House is on lockdown because of a security breach. 
 
 The Secret Service says two people threw something over the fence surrounding the White House complex — one person from the south side and one from the north. 
 
 The two people were being detained and questioned Thursday afternoon. Secret Service officers were ordering people in the West Wing to stay inside. 
 
 The incident follows an hourlong lockdown Tuesday after a vehicle followed a motorcade bringing President Barack Obama's daughters home through the gates. The driver was charged with unlawful entry, a misdemeanor. ||||| A member of the Secret Service stands near a car in front of the Eisenhower Executive Office Building on Pennsylvania Avenue next to the White House on Tuesday. (Photo: BRENDAN SMIALOWSKI, AFP/Getty Images) Tags Secret Service 
 
 Barack Obama 
 
 Officials locked down the White House for the second time this week on Thursday, this time because two people threw a pair of suspicious packages over the fence. 
 
 The incidents occurred at both the north and south fences, the Secret Service, and two men were in custody. 
 
 President Obama was in California at the time of the incident. 
 
 The lockdown lasted about an hour and 20 minutes in the mid-afternoon Thursday, as officials examined the packages. 
 
 On Tuesday, the Secret Service sealed off the executive mansion and ordered people indoors after an unauthorized vehicle entered an outer security perimeter. 
 
 Read or Share this story: http://usat.ly/Rvr8qx ||||| Evan J. Graham allegedly threw a cassette tape over the north fence line, the Secret Service said. Von Greenbrier Lerriche is suspected of throwing “miscellaneous papers” over the south fence line. 
 
 The items were thrown “in very close proximity,” Secret Service spokesman Ed Donovan said — both at about 2:52 p.m. 
 
 President Obama was out of town Thursday, headlining Democratic Party fundraisers in California. 
 
 According to a Secret Service statement, Graham was transported to George Washington University Hospital “after he complained of a medical condition while being interviewed.” He will be moved to the Metropolitan Police Department’s 2nd District station once he receives medical clearance, the statement said. 
 
 Lerriche has been transported to the 2nd District station for processing. 
 
 A Secret Service official said it was “unknown” whether the two men were together. 
 
 On Tuesday, the White House on lockdown for more than an hour after a motorist inadvertently followed the motorcade carrying President Obama’s daughters into the secure perimeter for the compound. 
 
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– For the second time in three days, the White House has had to go into lockdown mode because of a security scare, reports USA Today. This afternoon's occurred when two people threw packages over the White House fence—one on the north lawn and one on the south lawn, reports AP. Both people have been detained for questioning, and Secret Service has not said what was in the packages. President Obama is out of town in California today, notes the Washington Post. The incident follows one Tuesday in which a driver apparently made a wrong turn and followed the motorcade carrying the Obama daughters.