Nigerian authorities say the United States is sending troops to Nigeria to train the West African country's military in combating extremism as a multifaceted security crisis spreads in the north. A U.S. official said Wednesday that around 200 American troops are expected to arrive in Nigeria. The country has been a focus of Washington after U.S. President Donald Trump accused Nigeria protecting Christians from an alleged genocide. U.S. forces launched airstrikes on Islamic State group-affiliated militants in northwestern Nigeria in December. The head of U.S. Africa Command said last month that a small team of U.S. military officers were in Nigeria and focusing on intelligence support.