BOSTON -- Security at train stations in Massachusetts and across the country are stepping up security after terrorists' bombings killed nearly 200 commuters in Spain.

Video

Jorge Quiroga Reports On Security Statement:Amtrak Security Measures

NewsCenter 5's Jorge Quiroga reported that at Boston's South Station, there was a more visible police presence Friday. Massachusetts Bay Transportation Authority officers with dogs patrolled the terminal and others manned the platforms.

"I am definitely more nervous than I would have been coming onto the train yesterday," Boston resident Margaretta Hamsay said.

"I am concerned, but we are not going to stop our lives. We are not going to let this get to us," Salem, Mass., resident Debrah Kehoe said.

"It's a natural reaction. We all heighten our level of alert personally and individually," MBTA police spokesman Mark Gillespie said.

Heightened security follows the bombing of commuter trains in Spain. The headlines have many passengers uneasy.

"It does concern me, but I hope we are doing what we need to do," commuter Harold Wolozin said.

"I feel like something is going to happen in the United States. I don't know when, but I feel like something's in the air," South Boston resident Ann Ronkaitus said.

MBTA officials wouldn't go into details, but 77 surveillance cameras that are mounted at subway platforms monitor activity.

"It gives us the ability to respond quickly. We are always on alert," Gillespie said.

Passengers at train stations are not screened and there is no identification required for passengers.