Iraqi Prime Minister Haider al-Abadi announced the start of military operations to liberate the northern city of Mosul from Islamic State militants early Monday, launching the country on its toughest battle since American troops left nearly five years ago.

A member of the U.S. Navy was arrested after the pickup truck he was driving plunged off a San Diego bridge, killing four people and injuring nine at a festival below, authorities said.

Authorities identified the driver as Richard Anthony Sepolio, 25,  he was alone in the truck Saturday afternoon when he lost control and it struck a guardrail and fell 60 feet onto a vendor’s booth at Chicano Park, California Highway Patrol Officer Jake Sanchez said. He was taken to the hospital with major injuries and was later arrested on suspicion of driving under the influence of alcohol or drugs causing deaths and injuries.

China launched a pair of astronauts into space Monday on a mission to dock with an experimental space station and remain aboard for 30 days in preparation for the assembly of a full facility six years from now.