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A Yemeni man carries a wounded victim to a hospital after he was injured during an exchange of fire between tribal fighters supporting exiled Yemeni President Abedrabbo Mansour Hadi and Shiite Huthi rebels in the southern strategic city of Taez, on May 15, 2015. Image Credit: AFP

Sana’a: Fierce clashes between Al Houthi militiamen and pro-government forces killed dozens across South Yemen on Saturday, threatening to derail a humanitarian ceasefire drawn up to bring vital aid to the war-wracked country.

The five-day truce initiated by a Saudi-led coalition that has bombarded the Iran-backed militiamen for more than six weeks expires late Sunday, and Riyadh has already warned it was “ready to act” against any ceasefire violations.

In the latest violence, at least 12 civilians were killed and 51 wounded when Al Houthi militiamen shelled several neighbourhoods in Yemen’s third city of Taiz, military and local sources said.

The clashes came after overnight fighting killed 26 Al Houthi militiamen and militiamen loyal to former president Ali Abdullah Saleh as well as 14 pro-government forces, military sources said.

The United Nations has expressed deep concern about the civilian death toll from the Saudi-led bombing as well as the humanitarian impact of an air and sea blockade imposed by the coalition.

It says more than 1,500 people have died in the conflict since late March.

Some aid has begun to trickle into Yemen since the pause in fighting, but residents of areas where clashes persist complain they remain without the most basic supplies.

The fighting in Taiz overnight forced many to flee to the countryside.

“Humanitarian aid hasn’t reached Taiz, where we haven’t received fuel, food or medical equipment,” said a government official in the city.

The United Nations has called for the Saudi-led coalition to simplify import inspections after warning that supplies were still blocked.

UN coordinator Johannes van der Klaauw warned that the inspections, introduced under an arms embargo slapped on the Al Houthi militiamen last month, were hampering aid deliveries.

“The arms embargo and its inspection regime results in commercial goods, be it by air or by ship, no longer reaching the country,” he said.

Saudi Foreign Minister Adel Al Jubeir has accused the Al Houthis of repeatedly violating ceasefire terms, but the militiamen have pledged to honour the truce.

“We are hoping the Al Houthis will abide by the terms of the ceasefire and stop their aggressive behaviour if they want the ceasefire to hold,” he said.

But clashes rocked Aden on Saturday, an AFP correspondent said.

Heavy artillery, including tank shells, fell on the northern sector of the city, where militiamen and Hadi loyalists continue to fight over territory, including a main road giving access to central Aden, military sources said.

West Aden was also hit by shelling, they added.

And in southern Daleh province, five Al Houthis were killed overnight when their convoy was ambushed, an official said.

The chaos in Yemen has been exploited by armed groups, including the country’s branch of Al Qaida, which is viewed by the United States as the world’s most dangerous.

Twenty Yemeni soldiers were kidnapped by suspected Al Qaida members overnight in the southern port of Mukalla, an official said.

The extremist group has controlled Mukalla, the capital of Yemen’s vast desert Hadramawt province, since April and has for months claimed deadly attacks against Yemen’s government-controlled armed forces.

The official said Al Qaida militants seized the soldiers late Friday after accusing them of supporting the Al Houthis.

A conference on Sunday in Riyadh is set to bring rival Yemeni factions around the table in a bid to end the crisis, but the Al Houthis, who want talks to be held in Yemen, are boycotting the meeting.

Saudi Arabia has vowed to continue military action in Yemen until Hadi’s government is restored.