(AGI) Sana'a, Sept 19 - Fighting between Shiite Houthi rebelsand the Yemeni army in Yaraf has escalated. Around 70 rebelsare said to have been killed, while others continue to shellstate TV buildings. All three television channels are off air.Military reinforcements, including armoured vehicles and tanks,have arrived in Yaraf, a Houthi stronghold, where hundreds ofShiites have gathered over the last few days. Streets aredeserted and shops closed. . .