Four Transportation Security Administration agents spent Sunday and Monday at Albany Station, observing passengers traveling by train or bus.

Their visit was not triggered by Friday’s arrest of a former Oregon State student in connection with a failed bombing at Pioneer Courthouse Square and a Sunday morning arson fire at a mosque in Corvallis, according to spokesman Dwayne Baird of Salt Lake City, Utah.

Rather, it was a previously scheduled stop by what are known as Visible Intermodel Prevention and Response teams that are deployed nationwide.

A VIPR team may return to Albany around Christmas, one of the agents said.

“Their visits are scheduled long in advance,” Baird said. “We work with local law enforcement agencies to enhance security at mass transit, aviation and rail modes.”

Asked if the VIPR team deployments are common, Baird said, “Well, they’re not uncommon.”

The teams vary in size and the amount of time they spend in a community, he said. Teams might include federal air marshals, TSA officers or certified canine teams, surface transportation security inspectors and local law enforcement officers.