"ISLAMABAD — Prospects that Pakistan would join the Saudi-led air campaign against Houthi rebels in Yemen appeared to be evaporating Friday amid widespread concern that taking sides in what's perceived as a power struggle between Sunni Muslim Saudi Arabia and Shiite Muslim Iran could fuel Pakistan's already dangerous levels of sectarian violence."

Read more here: http://www.mcclatchydc.com/2015/03/27/261249/pakistani-fears-of-sunni-shiite.html#storylink=cpy