KARACHI, Pakistan, May 10 (UPI) -- Pakistan has arrested more than 100 Islamic activists in the past 24 hours, officials said Monday.
They said the arrests came as police looked for those responsible for a weekend suicide bomb attack in Karachi that killed 15 Shiite worshippers.
The separation of Muslims into the majority Sunni and minority Shiite sects dates from a historic division in Islam. Hundreds have died in Sunni-Shiite clashes in Pakistan since the mid 1980s.
Attacks on Shiite targets in Pakistan intensified after the Iranian revolution of 1979.
The weekend bombing led to a countrywide sweep for suspects by Pakistani police.
Separately, some Pakistani media, quoting unnamed intelligence sources, said extremists were planning more attacks on religious and other targets in Pakistan.
President Pervez Musharraf, who joined the U.S.-led war on terror after the Sept. 11 terrorist attacks, has pledged to cleanse his country of the extremists.
