At least 74 children have been killed since the Yemen conflict intensified almost two weeks ago and more than 100,000 people have left their homes in search of safety, the UN children's agency says.

Unicef said hospitals are struggling to treat large numbers of wounded people with insufficient supplies. The agency added that at least three health workers have been killed in attacks.

The agency said yesterday that fighting has disrupted the supply of drinking water in some southern areas and sewage is flowing in the streets, raising the risk of disease.

The Yemen conflict pits allies of the country's embattled president against Shiite rebels allied with his ousted predecessor.

Saudi Arabia, which supports the current president, has been leading an air campaign since March 26 against the rebels.