A 26-year-old Syrian refugee has been arrested in connection with Friday’s mass stabbing at a festival in western Germany, according to local officials, ending a day-long manhunt for the killer. The suspect, 26-year-old Issa al H., was drenched from the pouring rain and still covered in blood when he walked up to police officers around 11 p.m. on Saturday, telling them: “I’m the one you’re looking for.” He was immediately taken into custody. H. had apparently been hiding in the backyard of a home since Friday night’s attack, according to local media. Der Spiegel reported that the suspect arriv…