There is also massive destruction in the southern port city of Aden, where the Houthis have been retaliating along with militias loyal to Yemen's former president, Ali Abdulla Saleh, who was forced to step down after three decades in power, following popular protests in 2011. Power plants and both fixed line and mobile telecommunications networks are out of service in many cities in Yemen, with more joining the list everyday. Engineers are not able to reach stations to maintain them and put them back in operation.