MOUNT LAUREL, N.J. (AP) — A New Jersey legislator resigned Monday amid reports that he's under investigation for suspected possession of child pornography.

The clerk of the Assembly received a one-sentence letter from Assemblyman Neil Cohen Monday. Cohen said his resignation is effective immediately, but he did not offer any explanation.

Cohen has not been charged with a crime.

Colleagues who use the same legislative district office as the 57-year-old Democratic lawmaker said last week that they told law enforcement authorities about images of child pornography found on his computer.