Authorities investigating two incidents in which laser beams were aimed at aircraft flying over northern New Jersey (search) have questioned several people but made no arrests, the FBI said Saturday.

The pilot of a corporate jet first reported seeing the green lasers on Wednesday as he came in to Teterboro Airport (search) for landing. A police helicopter for the Port Authority of New York and New Jersey flew over the area Friday to investigate, and also spotted the lasers.

FBI Special Agent Steve Kodak said Saturday that no one was in custody. A spokesman for the Port Authority said a Parsippany resident was among those questioned.

Federal agents are looking into similar incidents involving lasers and aircraft, including cases in Cleveland, Washington, Houston, Colorado Springs, Colo., and Medford, Ore.

Laser beams can temporarily blind or disorient pilots and possibly cause a plane to crash.

Federal law enforcement officials have said there is no evidence of a terrorist plot involving laser beams, though last month the FBI and the Homeland Security Department (search) sent a memo to law enforcement agencies saying there is evidence that terrorists have explored using lasers as weapons.