U.S. officials have warned local authorities to be on the alert for terrorist attacks over the July Fourth weekend in the wake of deadly attacks Friday by the Islamic State that killed more than 60 people on three continents.

The joint intelligence bulletin from the Department of Homeland Security, the FBI and the National Counterterrorism Center was issued because of a great deal of chatter, a high volume if you will, House Homeland Security Committee Chairman Michael McCaul told Fox News Sunday.