LOS ANGELES (AP) _ Thousands of office workers streamed into downtown Los Angeles following the discovery of a suspicious package in the mail room of the Federal Building.

Workers from five buildings were ordered to leave for more than four hours Thursday before police detonated the package and announced it was full of harmless electronic equipment.

``We can chalk this up to another large-scale exercise,'' police Lt. Anthony Alba said. ``This was a test for us that I would say we passed very well.''

The bomb squad was called at 12:30 p.m. and authorities cleared the eight-story stone and glass Federal Building, which houses Immigration and Naturalization Service offices and courts, part of the U.S. Attorney's office and other federal offices.

Police also cleared the nearby Roybal federal building, the civic center mall and a water utility building. Traffic was diverted from a wide area.

Youngsters visiting the Los Angeles Children's Museum also were told to leave, creating headaches reuniting them with their parents.

The April 19, 1995, bombing of the Alfred P. Murrah Federal Building in Oklahoma City was recalled by some.

``You keep thinking of Oklahoma _ man, you keep thinking of Oklahoma,'' an unidentified Internal Revenue Service employee told KCAL-TV. ``I don't want to be in anything like that. I don't want anybody to ever be in anything like that.''

The bombing killed 168 people and injured hundreds of others.