Police in St. Louis County are investigating another laser strike on aircraft.
The that a green laser hit a police helicopter flying over the Webster Groves area Thursday night. Pilots could not find the source of the laser beam, and no arrests have been made.
Just last month, for pointing a green laser at another police helicopter in April 2010, temporarily blinding the pilots. He was never formally charged but spent a year on probation.
The Federal Aviation Administration reported more than 2,800 laser strikes nationwide in 2010.
