An 18-year-old has been arrested on suspicion of starting a suspicious fire that gutted a Bellevue mosque last week, police said. The arrest follows an investigation into the blaze at the Islamic Center of Eastside at 14700 Main Street, which had previously been damaged by arson in January 2017 and was vacant at the time of the latest fire. The investigators discovered that a traffic camera at the intersection of 148th Avenue and Main Street had captured video of five people running from the mosque about four minutes before the fire started.