Independence Mall evacuated

The area around Independence Mall was tied in knots this morning after a man and a woman attempted to enter the William Green Federal Building about 11 a.m. with "prohibited items," authorities said.

The couple was detained and federal agents searched a car in an adjoining garage, where they discovered additional "prohibited items."

Broadcast reports said the couple had ammunition and a knife in their pockets and a shotgun stowed in their car.

As a precaution, police evacuated the Federal Building, Philadelphia's best-known tourist attractions and a daycare center. A garage adjoining the federal building also was evacuated.

Traffic was diverted on 5th and 6th Streets between Market and Arch.

"As soon as the facilities are cleared, the public will be able to resume their activities," said Jerri Williams, an FBI spokeswoman.

Philadelphia police and Homeland Security continue to scoure the historic district.

Federal authorities are expected to issue a statement this afternoon with more details.