German Chancellor Angela Merkel called for greater supervision of her country's gun laws today, after a teenager shot dead 15 people last week before killing himself, according to Reuters. Merkel said she had been stunned by the massacre in the southwestern town of Winnenden, where 17-year-old Tim Kretschmer shot 15 people with his father's pistol, including 12 at his former school. Merkel told Deutschlandfunk radio it was crucial that rules about the storage of weapons and ammunition were applied. "Experts will certainly consider: Would it be possible to ensure (the compliance to rules) even further through unannounced controls or other means?" she said. She did not say whether such measures would include checks at individuals' homes. The killings in Winnenden has sparked calls by some politicians to tighten Germany's gun laws. Seventy-eight percent of Germans favour banning guns from private homes, an Emnid survey for Bild am Sonntag newspaper showed on Sunday.