SAN FRANCISCO — A report of a suspicious package found at a San Francisco International Airport security checkpoint closed the area to passengers for more than two hours Wednesday afternoon.

The package, which had been dropped into a big mailbox where people can send items that are not allowed through the checkpoint, was detected by a police dog, airport duty manager Jeff Littlefield said.

It turned out to not be a threat.

The closure of the checkpoint at domestic Terminal 3 lasted between 3:35 p.m. and 5:40 p.m. The terminal was not evacuated, Littlefield said. Investigators took the package, the contents of which were not released.

Bay City News Service contributed to this story.