Ethiopia's Nobel Peace Prize-winning Prime Minister Abiy Ahmed has declared a state of emergency in the restive Tigray region in response to an alleged attack by the Tigray People's Liberation Front (TPLF) on a federal military base.<img src="http://feeds.feedburner.com/~r/rss/edition_africa/~4/RaLkwaYvik8" height="1" width="1" alt="" />