Police to wheel out ‘sonic cannons’ that blast a deafening wall of sound for KILOMETRES at this weekend’s G20 protests

Queensland police will deploy so-called ‘sonic cannon’ devices at the G20 at the weekend, although they insist they will not be used as a ‘force option’.

According to a Fairfax Media report, police currently own two Long Range Acoustic Device (LRAD) models, which are capable of blasting clear sound in a fixed direction for up to two kilometres.

G20 protest organisers said they were baffled several weeks ago when police offered to show them the ‘ludicrous’ hardware at a police training academy .... http://www.dailymail.co.uk