A man is believed to have left suitcases in a Times Square subway station containing drawings of the Sept. 11, 2001 attacks and threatening remarks, police said.
The suspect left three suitcases, one containing a note warning "I'll be there next time 9/11," law enforcement officials said. Investigators said there were also several drawings depicting the terror attacks inside some of the bags.
Parts of Times Square were shut down after the three black bags were discovered, and trains were ordered to bypass the 42nd Street stop while the NYPD bomb squad was called in.
An "all clear" was issued after no explosives were found.
An NYPD spokesman declined comment and would not identify the man being questioned.
Authorities are investigating the man; he could be sent to a facility for psychiatric evaluation.
Investigators said the man is captured on video leaving the three bags in the station.
Officials said they are going to get a warrant to search the man's home as a precaution.