A Gulf mediator has left Yemen with no word on a possible agreement for a peaceful transfer of power, while shelling in the capital left at least three people dead on Wednesday.

A state news report says Gulf Cooperation Council chief Abdul Latif al-Zayani left Sana'a Wednesday after meeting with Vice President Abed Rabbo Mansour Hadi.

The head of the six-nation council traveled to Yemen on Monday in an attempt to revive a GCC plan that calls for Yemeni President Ali Abdullah Saleh to hand over power to a deputy.

Meanwhile, medical officials say artillery fire in Sana'a left at least three people dead and 16 wounded on Wednesday. The unrest between pro and anti-government forces erupted less than 24 hours after the two sides agreed to a cease-fire.

More than 70 people have been killed in clashes since Yemen's youth-led protest movement stepped up demonstrations last week. Some of Wednesday's unrest occurred as thousands of mourners gathered in Sana'a for funerals of some of the victims.

Diplomats have been trying to revive the GCC's long-stalled transition plan.

Mr. Saleh has agreed to the proposal three times since April. However, in each case, he has backed out before a deal could be signed.

The president remains in Saudi Arabia, where he is recovering from injuries sustained in a June attack on his presidential compound in Sana'a.