Security forces have killed about 4,000 terrorists and arrested 3,000 militants in operations against militants in the past eight years, citing military spokesman Athar Abbas. About 1,900 soldiers died in the fight against terrorists since 2001, Abbas told the broadcaster in an interview today. The military has killed 1,800 Taliban militants and arrested 2,000 in the operation in Swat valley this year, he said. About 340 soldiers have died in the Swat operation, Abbas said.