"We fear the (Shiite) Huthi (rebel) snipers who have taken up positions on rooftops but also the firing from the other (government) side," said Majed Mukaibar, a 32-year-old fisherman and father in the Red Sea town of southwest Yemen.
Ibrahim Saleh, a tradesman who works in southern Yemen's main city of Aden, told AFP that he has been trying since last week to evacuate his family from Mokha but has been thwarted by incessant gunfire.
"Information from the field indicates that military operations in the coastal region have forced most residents of Dhubab to flee the area," he said.
McGoldrick said "an estimated 20,000-30,000 people, almost one third of the population, are trapped in the town (of Mokha) and require immediate protection and relief assistance".
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Constant air strikes, shelling and sniper fire around the town had "killed and injured scores of civilians and have ground most services to a halt", including water supplies.
Military and medical sources said 25 rebels and six soldiers on the government side, which is being supported by a Saudi-led Arab coalition, were killed in the latest clashes today for control of Mokha.
Forces loyal to President Abedrabbo Mansour Hadi have been battling on three fronts but so far failed to penetrate the centre of Mokha, according to residents and military sources.
Before government forces launched a major offensive on January 7, Huthi rebels controlled virtually all of Yemen's 450-kilometre (280-mile) Red Sea coastline.
Conflict in Yemen escalated in March 2015 when the Saudi-led coalition launched air raids against the Huthi rebels, who had taken over the capital and seized swathes of the country's centre and north.
The war has cost more than 7,400 lives in the past two years, according to the UN's World Health Organisation.
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