Police placed opposition leader Benazir Bhutto under house arrest for the second time in four days to prevent her staging a march Nov. 13 to protest emergency rule.

The showdown over Bhutto's planned march from Lahore to the capital, Islamabad, intensified the crisis engulfing Pakistan and further clouded the prospect of a pro-U.S. alliance against rising Islamic extremism forming between Bhutto and President Gen. Pervez Musharraf.

Bhutto's close aide, Sen. Safdar Abbasi, said the seven-day detention order was not binding because neither Bhutto nor one of her representatives had been served with the document.