In Paris, France, a gunman opened fire with an automatic rifle on the Champs-Élysées Thursday, killing a police officer and seriously wounding two others before he was shot dead. Police identified the attacker as Karim Cheurfi, a French citizen who served 15 years in prison after he was convicted in 2001 of shooting police officers. ISIS claimed responsibility, saying one of its “soldiers” carried out the attack. The assault came just days before French voters head to the polls Sunday for an election that will see the top two presidential candidates advance to a runoff election on May 7.