A shooting at Welfen-Gymnasium in Schongau is injuring several people and leaving a suspect in custody as police secure the campus.Bavarian police report four people with serious wounds while other injuries remain under assessment and investigators describe the case as a suspected amok attack.More than 15 patrol units and several police helicopters are operating at the scene and officers have set up a support center at the local firehouse for relatives and parents.Authorities are urging the public to avoid the area while prosecutors and investigators work to secure the scene and interview witnesses; no motive or weapon details have been released.