BERLIN — Detectives launched a large-scale manhunt across Berlin on Friday after a stabbing at the city’s Holocaust memorial, two days before the country’s national elections.

Three hours after the incident, officers sweeping through streets near the scene came upon an unidentified man whose hands were covered in blood, police said. He surrendered without saying anything, Florian Nath, lead spokesperson for the city’s police department, told NBC News at the scene.

Police are treating him…