Aid group says death toll from rebel shelling near Yemen's Aden doubles to nearly 100

A Yemeni man carrying his daughter looks at a building destroyed during fighting against Houthi fighters in the port city of Aden, Yemen, Sunday, July 19, 2015. Shiite rebels and their allies in Yemen randomly shelled a town Sunday outside of Aden after losing control of some the port city's neighborhoods, killing at least 45 people and wounding 120, officials said. (AP Photo/Ahmed Sameer) (The Associated Press)

Firefighters work at the storage tanks of an oil refinery following rocket attacks by Shiite rebels, known as Houthis, in the port city of Aden, Yemen, on Tuesday, July 14, 2015. Yemeni forces battling the Shiite rebels in the country's south said they took control on Tuesday of the airport in the strategic port city of Aden, driving the rebels there into the part of the city jutting out into the sea. (AP Photo/Abo Muhammed) (The Associated Press)

A vendor salvages goods from the rubble of his shop destroyed by a Saudi-led airstrike at a market in Sanaa, Yemen, Monday, July 20, 2015. The death toll in Yemen from the Shiite rebel shelling of a town near the southern port city of Aden rose on Monday to nearly 100, the head of an international aid group said, describing it as "the worst day" for the city and its surroundings in over three months of fighting. (AP Photo/Hani Mohammed) (The Associated Press)