A London march organized by a far-right activist drew more than 110,000 people and became unruly Saturday as a group of his supporters clashed with police officers who were separating them from counterprotesters. Several officers were punched, kicked and struck by bottles tossed by participants in the “Unite the Kingdom” rally, Metropolitan Police said. Reinforcements with helmets and riot shields were deployed to support the 1,000-plus officers on duty. Twenty-six police officers were injured — four seriously, including broken teeth and a concussion, a possible broken nose and a spinal injury. At least 25 people were arrested for offenses including violent disorder, assaults and criminal damage, and the investigation continues, police said.