Two NATO service members were killed in southern Afghanistan where foreign forces are trying to hold territory they gained after routing insurgents from their strongholds, the coalition said Tuesday. One service member died in an insurgent attack and the other was killed in a roadside bombing. No other details were disclosed about the deaths, which occurred on Monday. According to an Associated Press tally, 512 international troops have been killed so far this year in Afghanistan. At least 382 of those killed were Americans. In eastern Afghanistan, four civilians were killed on Tuesday when their car hit a roadside bomb in Alingar district of Laghman province, said provincial spokesman Faizanullah Patan.