LOS ANGELES, Calif. — Southland law enforcement officials were on heightened alert today as they monitored the investigation into bombings at the finish line of the Boston Marathon that killed two people and injured nearly two dozen more.

“While the cause of the explosions this morning at the Boston Marathon are still under investigation, our vigilance has been raised,” Los Angeles County Sheriff Lee Baca said. “The heightened alert of the Los Angeles County Sheriff’s Department includes increased patrols to create a more visible presence where people congregate, such as government buildings, shopping
centers, athletics events and public transit.”

Baca said the department was working closely with other public safety agencies, although county officials said the Los Angeles County Emergency Operations Center had not yet been activated.

Los Angeles Police Department officials said they were keeping close tabs on the situation in Boston.

Security was stepped up at Metro facilities, including Union Station, with additional officers and K-9 units, according to Marc Littman, a spokesman for the transportation agency.

“There is a heightened police presence,” Littman said.

He said there was no disruption to any service, but passengers will see more officers on patrol. As usual, Littman urged passengers to report any suspicious activities on buses and trains or at stations.