WASHINGTON (AP) -- The Pentagon says the U.S. and its Arab allies are launching more airstrikes into Syria against Islamic State militants.

Missiles bound for Syrian Islamic State group targets are launched off of a U.S. Navy ship Monday night. (AP Photo/U.S. Navy via AP video)
Missiles bound for Syrian Islamic State group targets are launched off of a U.S. Navy ship Monday night. (AP Photo/U.S. Navy via AP video)
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Pentagon spokesman Navy Rear Adm. John Kirby told CNN that U.S. and coalition forces hit 12 targets, including oil refineries that were providing up to $2 million a day in income to the Islamic State Group.

The strikes are a continuation of the broader military campaign that began Monday against the militant group. Four Arab nations -- Bahrain, Saudi Arabia, Jordan and United Arab Emirates -- participated in those strikes, and Qatar supported the attacks.

The Pentagon released no details on the strikes or which countries were participating, but said the operation was ongoing.

As of Tuesday, according to U.S. Central Command, the U.S. had conducted airstrikes that hit at least 20 locations in Syria. Combat aircraft flew 64 sorties.

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