A Rwandan soldier serving with the U.N. peacekeeping mission in Central African Republic shot dead four Rwandan troops and wounded eight others on Saturday, before himself being shot dead, according to the Rwandan Defence Ministry. "Investigations have immediately commenced to establish the motive behind this deplorable shooting," spokesman Brigadier General Joseph Nzabamwita said. "We suspect terrorism, without ruling out mental illness as the cause." The statement said the injured soldiers had immediately been transported to a hospital in Bangui for treatment.