NEWARK — New Jerseyans don't have to look far to find a police officer at the state's transportation hubs.

Officials have increased security Tuesday following Monday's Boston Marathon explosions.

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NJ Transit spokesman John Durso Jr. says passengers are monitoring their surroundings and, in some cases, have alerted officials about their concerns.

State Police Lt. Stephen Jones says there is no known threat. But the agency's bomb unit, aviation crews, tactical teams, and search and rescue assets have been deployed as a precaution.

The Port Authority also is on a heightened state of alert at bridges, tunnels and on its PATH rail line between New Jersey and New York.

Atlantic City's 12 casinos remain open, and executives say they have not been told by authorities to undertake any unusual security measures.

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