Story highlights Security ramped up after breach in perimeter fence of DNC

(CNN) Seven protesters who breached the outer perimeter fence surrounding the Democratic National Convention in Philadelphia were arrested Wednesday night, according to the Secret Service.

The protesters got into the Secret Service designated zone, but did not enter the Wells Fargo Center, where the convention is being held, according to the security agency.

The seven were dressed in all black and had their faces covered.

They were arrested and have been taken to the Philadelphia Federal Detention Center, where they're expected to be charged with entering a restricted area.

Protesters appeared to have jumped the fence near the Broad Street SEPTA station, prompting a ramp-up of security at the perimeter. About a 100 Secret Service and police officers were at the point where the breach took place Wednesday night. Helicopters continually circled over the lot, shining lights in a nearby parking lot.

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