As Germany mourns the victims of Wednesday’s school shooting, police now doubt the teenage gunman warned of his deadly plan on the internet.Regional authorities had claimed Tim Kretschmer posted a message in a chatroom saying he would go to his former school, armed with weapons. But police have now indicated there was no trace of such a message on the 17-year-old’s computer. Described as a loner with a fondness for violent videos, the teenager killed 15 people, 12 of them at his former school in Winnenden near Stuttgart. He then shot himself dead. Germany’s Foreign Minister Frank-Walter Steinmeier said discussions would be held on strengthening firearms legislation. But he warned: “Lets not pretend a few political gestures or laws could put an end to terrible attacks like this.” Authorities are now looking into whether to press charges against Kretschmer’s father. He owned more than a dozen guns, all locked away except the Beretta pistol that caused the carnage. Police also found 4,600 rounds of ammunition at the family home.