(Adds details) KABUL, Mar 14 (Reuters) - An Afghan army patrol was attacked by a suicide bomber in Kabul on Wednesday, witnesses said. There were no immediate details of casualties from the blast, in a busy area of the capital. Last year, the bloodiest since the Taliban's ouster in 2001, the city was rocked by several suicide attacks that killed dozens. The Taliban say they will step up suicide attacks across the country this year.
