Four security forces personnel were killed in a suicide attack in northwestern Pakistan on Monday, the army said in a statement.
A suicide bomber hit a security forces check post on Monday morning in Khawazakhela area in the restive Swat valley of North West Frontier Province, said the statement, reproted Xinhua.
As a result, four security men were killed and three others suffered injuries.
The security forces have been cracking down on pro-Taliban militants in Swat valley and vowed to eliminate them.