BOSTON >> Authorities in Massachusetts say they're stepping up security after explosions killed dozens of people at an airport and subway station in Brussels, Belgium.

The Massachusetts Bay Transportation Authority said Tuesday that staff will be "stepping up their vigilance and visibility" with Transit Police posted at stations and platforms.

State police said they've increased patrols near transportation centers and are monitoring information related to the terror attacks.

Logan Airport's operator said it doesn't discuss specific security measures but said in a statement they're "multi layered and constantly evolving."

Gov. Charlie Baker took to Twitter to assure residents that security has been strengthened on public transit systems and airports and that law enforcement "will remain vigilant." He also said he's "deeply saddened" at the deaths of victims in Belgium attacks.