Authorities have arrested a man they claim was plotting to detonate pipe bombs in and around New York, Mayor Michael Bloomberg said Sunday night.

The intended targets of Jose Pimentel, 27, were U.S. military personnel who had served in Iraq and Afghanistan, as well as U.S. postal facilities and police stations, according to Bloomberg and Police Commissioner Ray Kelly.

The suspect was described by Bloomberg as an “al Qaeda sympathizer,” though he is not believed to have ever made direct contact with anyone in the organization.”There is no evidence he worked with anyone else,” Bloomberg said. “He appears to be … a lone wolf.”