Somalia’s al Shabaab insurgents called Wednesday for more foreign militants to join them in the failed Horn of Africa state after U.S. forces killed one of the region’s most wanted al Qaeda suspects.

The U.S. special forces operation that killed Kenyan-born Saleh Ali Saleh Nabhan, 28, in remote southern Somalia Monday has triggered an angry response from Islamist rebels fighting the nation’s U.N.-backed government.

The raid likely gained Washington valuable counter-terrorism intelligence, but risked further inflaming anti-Western opinion in a country of growing concern, experts say.

Nabhan, who was wanted over a truck bombing that killed 15 people at an Israeli-owned beach hotel in Kenya in 2002 and a simultaneous but failed missile attack on a Israeli airliner as it left nearby Mombasa, was allied with al Shabaab.

Washington says al Shabaab is al Qaeda’s proxy in Somalia.