LAGOS, Nigeria (AP) — Security forces raided areas near the site of two bombings in Nigeria’s capital and detained eight suspects including foreigners on Saturday, the Ministry of Defense announced as the city prepared to host a three-day international conference.

All schools and government offices in Abuja, the capital in central Nigeria, will close during the May 7-9 World Economic Forum on Africa, according to a presidential order that follows two bomb attacks in three weeks that killed nearly 100 people. Islamic extremists are blamed for both.