Munich attack

WhatsApp chat also showed the Afghan knew attacker was in possession of a Glock 17 firearm, says Steinkraus-Koch

"We suspect that this boy aged 16 years could have been aware of the act," Munich police said in a statement

"He had been preparing (the shooting) for a year," Bavarian police chief Robert Heimberger told a news conference

David Ali Sonboly used the internet to plan and carry out the attack

On July 22, 2011, Breivik killed eight people in a bombing outside a govt building in Oslo, gunned down another 69