Meanwhile, cross-border fighting in the disputed Kashmir region continues, with new artillery and mortar skirmishes breaking out over the weekend. Thousands of villagers on both sides of the Line of the Control, which divides Indian and Pakistani-administered Kashmir, have fled their homes.
Pakistan's ambassador to the United States has denied reports that Pakistan was moving troops from its western border with Afghanistan, where they are assisting U.S. troops in the fight against the Taliban and al Qaeda militants.
"As yet, no significant movement has taken place, but of course if the situation continues to worsen, we will have to move more," Maleeha Lodhi told CNN on Sunday.
U.S. Defense Secretary Donald Rumsfeld and Deputy Secretary of State Richard Armitage are set to visit India and Pakistan later this week and Chinese President Jiang Zemin is also expected to add his weight to the diplomatic push to get the two sides to meet on the sidelines of the summit in Almaty. ABCNEWS' Jim Sciutto in Islamabad, Pakistan, contributed to this report.