PHILADELPHIA (CBS) -Mayor Michael Nutter held a press conference Monday night to discuss public safety in the city of Philadelphia.

“Philadelphia is at a heightened level of security at this point,” said Nutter.

Philadelphia police in coordination with Amtrak, SEPTA, Parks & Recreation Department, and the U.S. National Park Service are all on heightened alert.

“If you see something, say something,” said Nutter.  He advised the public to report suspicious activity by calling  911, 311, or the police tip line at 215-686-8477.

The heightened level of security comes after the explosions at the Boston Marathon that occurred on Monday.

Police issued over scanners an advisory for officers to keep a look out for suspicious vehicles and report anything out of the ordinary to Homeland Security.

Police are also advising officers to monitor public transportation lines and courthouses and to check for identification at all city government buildings.

Amtrak Police Department is stepping up patrols and conducting increased sweeps of stations and track right-of-ways.  Amtrak Police is also holding-over officers to ensure adequate staffing.

Amtrak reminds customers to report all suspicious activity by dialing 911 or  1-800-331-0008.

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