Newborn Yemeni conjoined twins whose plight sparked a plea for urgent medical treatment overseas died in Sanaa Saturday, rebels in the blockaded capital said.

Wounded Yemeni rebels arrived at Sanaa airport to be flown to Oman for treatment in a 'confidence-building' measure Monday, as the UN envoy returned seeking to push ahead with planned peace talks.

The Saudi-led coalition has launched airstrikes on an airbase near the international airport in the Yemeni capital Sanaa, state-run Saudi media reported early Friday.

Multiple military sources reported the government alliance attempted on Friday to close in on rebel-held Hodeida.

The economic downturn, along with a blockade on the rebel-held international airport and ports, has left Yemenis unable to afford food staples and bottled water.

A woman was among four people killed in an air strike that hit a petrol station in Yemen's rebel-held capital late Saturday, medical sources said.

Two air raids targeted the office of the presidency in Yemen's rebel-held capital Sanaa on Monday, leaving at least six people killed and 30 wounded, a medical source told AFP.

A Saudi-led military coalition intervened in Yemen on March 26, 2015 to try to restore the government of President Abedrabbo Mansour Hadi.

The Saudi-led coalition is the only force known to carry out air strikes on Houthi rebel-held territory and has previously admitted to "erroneous" strikes that caused civilian casualties.

A Saudi-led air strike killed at least six allied Yemeni soldiers on Monday in friendly fire attacks on their base 50 kilometres (30 miles) east of Sanaa, a military source said.

An air raid hit the criminal investigations unit in Yemen's rebel-held capital Sanaa on Sunday as insurgents battle the government, backed by a Saudi-led coalition, for control of the country. The four-storey building and a line of police cars parked outside were largely destroyed in the attack.

A Saudi-led coalition air strike hit Yemen's rebel-controlled state television station in Sanaa overnight, killing four guards, rebel media and the head guard said on Saturday.