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The blue-green shaft of light was from a laser said to be "the world's most powerful display laser." According to Mat Lawrence from the laser company Kvant, advance notice had been made to the U.K. Civil Aviation Authority before the test was done.
Lawrence said the beam could be seen from 20 miles away.
This is roughly one-third of the 700 incidents over the same time frame that involved aircraft in or above the West Midlands. (The 480 non-laser incidents included bird strikes, emergency landings, a bomb threat, a dog on the runways and closure of an airfield because of a flying kite.)
On one occasion in July 2011, four different lasers were aimed at a police helicopter in a single incident.
The British Airline Pilots’ Association asked for prison sentences for persons caught aiming at aircraft, as well as regulations over the sale of high-powered lasers.”
According to West Midlands police, laser attacks on their helicopter have fallen in months prior to July 2013.
From the Birmingham Mail. See also a related LaserPointerSafety.com article on BALPA’s laser pointer suggestions.