UPDATED: Police Investigate Suspicious Envelope with Residue at Beverly Hills City Hall

A suspicious envelope found by a secretary in a Beverly Hills City Hall office prompted an evacuation and street closure today, but the material turned out to be harmless, a police lieutenant said.

A secretary who was opening mail in a office on the fourth floor of City Hall saw an envelope with a white residue on the outside of the envelope," Beverly Hills police spokesman Lt. Lincoln Hoshino. "The secretary washed her hands and then called police."

Hoshino said that investigators determined the white residue was a natural part of the manufacturing process and was harmless.

"We also know who the envelope came from and we've talked to that person," Hoshino said. "So it's all good. We're just documenting the incident now."

City Hall was reopened as of 3:17 p.m., he said.

The envelope was discovered at 1:41 p.m. in City Hall at 455 N. Rexford Drive, Sgt. Sean Smollen said.

The investigation was being handled by a combination of police and fire units, he said.

Police temporarily closed Rexford Drive between north and south Santa Monica Boulevards which was reopened after the all-clear was given.