The aircraft pounded five schools converted by the Shiite rebels into military bases in Ataq, the capital of Abyan province, military sources said.
The raids killed at least 12 insurgents and troops loyal to former president Ali Abdullah Saleh, who has allied himself with the northern rebels against the government of President Abedrabbo Mansour Hadi, the sources said.
Also in Abyan, warplanes targeted rebel positions on the outskirts of Loder, the province's second largest city, witnesses said.
Fierce fighting also raged in the central city of Taez, with the warring parties using tanks and rocket-propelled grenades inside residential areas, local officials said.
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Medics said at least 16 civilians were killed in Taez yesterday. Coalition warplanes meanwhile hit rebel positions east of Taez overnight, witnesses said.
The United Nations says more than 1,000 people have been killed in fighting in Yemen since late March, when Saudi Arabia assembled an Arab coalition in support of Hadi.
The embattled leader asked for Gulf intervention after the rebels closed in on his refuge in the southern port city of Aden after they had overrun several provinces since September, including the capital.
Air strikes have continued despite a coalition announcement last week of an end to its air campaign dubbed "Operation Decisive Storm".
The coalition is now working on military and political fronts to reestablish the legitimate authority in Sanaa, Abu Dhabi Crown Prince and UAE armed forces chief Sheikh Mohammed bin Zayed al-Nahayan said.
The campaign's new phase is based on a "multilayered strategy, including military, as well as politics and development, to reestablish the legitimacy," he said during a visit to UAE armed forces in Saudi Arabia taking part in the coalition.
"We have no other choice but to succeed in the test of Yemen," he said, according to UAE daily Al-Ittihad.