Relief workers have warned of a dire situation in the impoverished Arabian Peninsula state, where a Saudi-led coalition is waging an air war on the Iran-backed Huthi Shiite rebels.
Most of the 114 deaths in the past 24 hours occurred in fighting between rebels and loyalists of President Abedrabbo Mansour Hadi in the main southern city of Aden.
Seventeen civilians were among 53 people killed in Aden where fighting continued as rebels tried to seize a port in the city, which sits on an extinct volcano jutting out into the sea.
Seven more people were killed in the southern province of Abyan, where pro-Hadi fighters have laid siege to the base of a renegade army brigade loyal to ex-president Ali Abdullah Saleh, who is accused of backing the Huthis.
More From This Section
In nearby Lahj, coalition air strikes hit the strategic Al-Anad airbase and a nearby military camp, killing 10 rebels and forcing many others to flee, an army source and witnesses said.
In Shabwa province, eight rebels were killed in an air raid as two others died in clashes with tribes, sources said.
Hadi fled to Saudi Arabia last month as rebels advanced on his southern stronghold, prompting the military campaign by the Saudi-led coalition, now in its 12th day.
Yemen, strategically located near key shipping routes and bordering oil-rich Saudi Arabia, is sinking deeper into a multi-sided civil conflict.
The fighting has drawn in an array of armed groups including the Huthis, pro-Hadi militia, army units loyal to Saleh, southern separatists, Sunni tribes and Al-Qaeda militants.
It has been trying to fly emergency supplies into Sanaa but the plane is still stuck on the tarmac.
"We have a cargo plane with medical supplies which is ready to go," said Sitara Jabeen, a spokeswoman for the International Committee of the Red Cross.
"We have the permission for this plane but we have logistical problems for the landing. There are less and less planes landing in Yemen. We are trying to solve the logistic problems," she told AFP.