The Islamic State in Syria as officially opened a new front for its terrorism and violence–Egypt.

On Thursday, for American troops were injured in an IED blast orchestrated by ISIS agents near the Egypt-Israeli border. No troops are in critical condition or severely hurt.

The soldiers injured are four of 700 American participating in Task Force Sinai, an American military force deployed to uphold the Multinational Force and Observers 34 year-old peacekeeping mission and prevent war between Egypt and Israel. While they are not technically fighting ISIS, these Americans often fight ISIS agents attempting to add Egypt to the group’s territory.

The Military Times reports:

For years, “Task Force Sinai,” as the U.S. contribution to the MFO is known, was an uneventful mission, historically assigned to reserve units.

But now, amid daily fighting between Egyptian military forces and an ISIS branch known as Wilayat Sinai, American MFO troops sometimes struggle to get food, water and other logistical supplies into their secure compounds. Armed militants often harass the force’s contractors, and these days the Egyptian military commonly provides armed escorts for logistics convoys, according to the mission’s annual report.

Egypt has become central to a larger ISIS strategy to create a “caliphate” that stretches across Sunni Arab countries. ISIS-linked groups have seized control of parts of the Sinai in Egypt’s east and are gaining ground in Libya across Egypt’s border to the west. Scattered attacks also are reported in Egypt’s heartland along the Nile River and its delta.