Hennepin County authorities are investigating after an alleged assault left a teenager severely injured at a Twin Cities YMCA.According to a search warrant filed in district court Thursday, the alleged beating occurred on Dec.

The family of the Edina High School student who was attacked at the YMCA last week says they’re “broken” over the assault that left him with a concussion and multiple bruises.

The bloodied teen victim was located by officers when they arrived and told police the accused attackers were all students at Edina High School.

While in the back of the ambulance ... the victim’s mental state was declining by the reptitiveness of his statements and lack of memories,” a court filing read.