Global

Large explosion shakes Afghan capital, casualties unclear



    KABUL (Reuters) - A large explosion shook houses in Afghanistan's capital on Tuesday, a Reuters witness said, but it was so far unclear what had caused the blast and whether there were any casualties.

    The blast came a day after a magnetic bomb killed two U.S. troops in Kabul, which has seen an increased number of attacks by the Taliban and other insurgents as foreign troops withdraw.

    (Reporting by Kay Johnson)