The U.S. sent troops to Nigeria in February in what was deemed a mostly advisory and training role, but the joint operation signals more active involvement.

WASHINGTON: US and Nigerian forces killed a leader of the Islamic State group in Nigeria in a mission carried out Friday, US President Trump said.

The Nigerian military has announced the elimination of more than 20 suspected ISIS/ISWAP fighters in fresh coordinated airstrike operations carried out with the support of the…