North Korea fired seven short-range projectiles from its east coast Tuesday using a multiple rocket launcher, Seoul's defense ministry said, the latest in a series of provocations by the communist country as the U.S. and South Korea entered the second week of joint military drills. The North fired off three short-range projectiles using a 240 mm multiple rocket launchers at around 6 a.m from Wonsan on its southeastern coast, the ministry said. They flew about 55 kilometers in the northeast direction. It launched four more beginning at 4:17 p.m. using a longer-range rocket launcher from the same region, with the range of about 155 km, it said.