WASHINGTON (AP) — American fighter jets and drones continued to pound Islamic State militants in Iraq on Wednesday, and military planners weighed the possibility of sending a small number of additional U.S. troops to Baghdad, U.S. officials said, even as the insurgents threatened to kill a second American captive in retribution for any continued attacks.

The airstrikes came in the hours after militants released a gruesome video Tuesday showing U.S. journalist James Foley being beheaded and underscored President Barack Obama’s vow Wednesday afternoon to continue attacks against the group despite its threats.