Islamic State supporter warns of attacks against U.S. - SITE

BEIRUT (Reuters) - A supporter of Islamic State militants has warned of attacks on the United States and its allies if they continue to carry out military action against the group that has seized large parts of Iraq and Syria, the SITE monitoring service said.

The message on a well-known militant Islamist online forum is one of the few responses from supporters of Islamic State to Washington's announcement last week that it was prepared to extend airstrikes against the group into Syria.