Israel appears to have intensified its military offensive in the West Bank after US President Bush demanded that it withdraw from Palestinian areas "without delay". Two villages around Ramallah were the latest targets of Israeli tanks and helicopter-borne troops, eyewitnesses said on Sunday morning. President Bush said in his strongest statement yet that he expected Israel "to heed his advice" about halting incursions. Israeli Prime Minister Ariel Sharon told him on the phone later that Israel would speed up, but not stop, its offensive against Palestinian militants.