WASHINGTON (AP) -- Persistent violence in Syria and Egypt has sharply divided senior advisers in the Obama administration over a moral dilemma: How far should the U.S. go to stop the killing when its actions could lead to war with Syria or damage relations with Egypt?

Hundreds have died in Egypt during protests brought on by the military overthrow of President Mohammed Morsi. In Syria, allegations of chemical weapons attacks on civilians by the government of President Bashar Assad come amid reports of hundreds more victims in a 2-year-old civil war that, by U.N. estimates, has already killed more than 100,000.