The bomber who blew himself up outside a Nairobi hotel this month, launching an attack that killed 21 people, was already so well-known to Kenyan police that they had emblazoned his face across billboards under the slogan “WANTED: DEAD OR ALIVE”.

Mahir Khalid Riziki was barely 20 when he joined a radical Islamist cell that assassinated police in his home town of Mombasa, officers said. His mosque in the coastal Kenyan city funneled recruits to the Somalia-based Islamist group al Shabaab, which claimed the Jan. 15 attack in Nairobi.

Read more: Reuters