YAOUNDE, Cameroon, Shawwal 14, 1436, Jul 30, 2015, SPA -- Nigeria's president is promising deeper collaboration with its neighbors in the fight against religious extremism after a two-day visit to Cameroon, AP reported. Nigeria's President Muhammadu Buhari headed home Thursday after meeting with his counterpart for two days of talks focused around the threat posed by terrorist Boko Haram group. Cameroon along with neighbors Niger and Chad are helping Nigeria's military in the fight against the group. --SPA 16:58 LOCAL TIME 13:58 GMT www.spa.gov.sa/w