BERLIN — Investigators have found what appears to be a claim of responsibility by the suspect in the fatal attack near Berlin’s Pride festival , German authorities said Tuesday.

The 21-year-old suspect, Abdul Ballout, was killed in a confrontation with police on Sunday, the day after investigators say he drove a van into a crowd near the festival’s closing party before apparently cutting others with a machete. A Polish woman was killed and 31 other people injured.