A suicide bomber attacked the Bari Imam shrine in Islamabad, Pakistan, on May 27, killing as many as 20 people and injuring more than 50. The blast occurred during the annual festivities marking the anniversary of the death of 17th century Sufi saint Shah Abdul Latif Kazmi, to whom the shrine is dedicated. The timing of the attack — when Islamabad and Washington have stepped up operations against al Qaeda in Pakistan and neighboring Afghanistan — suggests this is the work of Pakistani affiliates of the jihadist network. Militant Deobandi and, to a lesser degree, Wahhabist groups have staged attacks in the past against Shiite and other Pakistani government and foreign targets, including President Gen. Pervez Musharraf, his current deputy Gen. Ahsan Saleem Hayat and Prime Minister Shaukat Aziz. The May 27 attack is the second such attack against a Sunni shrine.