The Swedish head of a safari company and 10 of his staff have been arrested after 13 miners were found murdered in the northeast of the Central African Republic, police said Wednesday.

Erik Mararv, a professional hunter who heads the Central African Wildlife Adventures company, and the 10 employees "were detained this month in Bakuma and Bangassu and taken to Bangui," police said.

U.S. President Barack Obama said Friday he is sending 100 combat troops to central Africa to help and advise forces battling the Ugandan Lord's Resistance Army rebels accused of gross human rights abuses.

"These forces will act as advisers to partner forces that have the goal of removing from the battlefield Joseph Kony and other senior leadership of the LRA," Obama said, but warned they would not lead the fighting themselves.