SEASIDE PARK, N.J. -

A New Jersey congressman says the person responsible for the pipe bomb blast in a shore town before thousands of runners were due to take part in a charity 5K race to benefit marines and sailors is "mentally unhinged."

Rep. Tom MacArthur, R-Toms River, described the Seaside Park community as military centered, with lots of veterans and active duty military personnel. He says those in the area have been through a lot, with Superstorm Sandy and its aftermath, and now the bomb blast.

He said he's confident law enforcement will find the person responsible. MacArthur says that person needs to be "tracked down and brought to justice."