A gunman injured several people in an attack inside a lecture hall at Germany’s Heidelberg University on Monday, police said. Police said the perpetrator, who used a long-barrelled firearm, was dead and is believed to have acted alone. They did not immediately provide details on how the attack unfolded. However, sources close to the investigation told dpa that the man turned his gun on himself. It was also not clear how many people were injured and how seriously. The Neuenheimer Feld area of Heidelberg, near the historic university, has been cordoned off.