JERSEY CITY - New Jersey security officials are watching the state’s most visible bridges and tunnels after yesterday’s double bombing at the Boston Marathon, but drivers may not notice any increased police presence.

Though there is no known threat, authorities say they are not taking any chances.

Jersey City Police Chief Thomas Comey issued a statement saying the department has increased police presence at local transportation hubs.

Drivers at the entrance to the Holland Tunnel told News 12 New Jersey they are operating with a heightened sense of awareness after the Boston bombings, but will go through their day as usual.

Jersey City’s mayor has also reached out to the mayor of Boston and offered the city help.