Although no one has claimed responsibility for the “act of terrorism” at the Boston Marathon yesterday, there is a person of interest in the case, a 20-year-old Saudi national who entered the U.S. on a student visa. He is the same person of interest being guarded at a local hospital.

His apartment in a nearby Boston suburb was searched late last night:

Investigators were seen leaving the Revere house early Tuesday carrying brown paper bags, plastic trash bags and a duffel bag, according to the Associated Press.

The Pakistani Taliban, which has threatened attacks in the United States because of its support for the Pakistani government, denied any role in the marathon bombings Tuesday.