An apartment has been searched in the German state of Hesse following a knife attack at an event in the city of Mannheim that left a police officer critically injured, according to the state criminal police office (LKA). The search on Friday evening was linked to investigations related to Mannheim, an LKA spokesman said on Saturday. Media reports suggesting it was the apartment of the suspected perpetrator were not initially confirmed. The attack occurred on Friday morning during an event hosted by the anti-Islam Pax Europa movement. Several people were injured, including the policeman. The pe…