A rescue agency spokesman said a helicopter carrying Nigerian government officials has crashed in the country's oil-rich southern delta, causing unknown injuries, according to AP. Yushau Shuaibu, a spokesman for Nigeria's National Emergency Management Agency, said the helicopter crashed Saturday in Bayelsa state in the Niger Delta. He said the helicopter was carrying high-ranking government officials, but he did not have a final manifest for the flight. Shuaibu said rescuers have begun searching for the downed helicopter.