A bomb technician works with an explosives-disposal robot Thursday to recover an unknown item that was thrown over the fence on the north side of the White House. (Pablo Martinez Monsivais/AP)

The White House was put on lockdown for the second time this week after two people threw items over fences on opposite sides of the presidential compound at almost exactly the same time Thursday, the Secret Service said.

The lockdown — which went into effect just before 3 p.m. — was lifted after about 90 minutes and both suspects were charged with “throwing objects — missiles,” according to Secret Service officials.

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.

A map showing how a man followed a motorcade into the White House grounds. (By Darla Cameron/The Washington Post/Charging documents)

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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