Yemeni anti-government protesters call for the ouster of President Ali Abdullah Saleh at a demonstration in Sanaa on May 12. (Mohammed Huwais/AFP/Getty Images)

A doctor told AP that three people were killed Friday in Ibb, an agricultural town south of Sanaa, after Yemeni troops opened fire on thousands that marched in a funeral procession. Ten were left in critical condition. Demonstrations stretched for four miles in the capital of Sanaa.

President Ali Abdullah Saleh remained defiant Friday, warning the opposition “to stop playing with fire”and threatening to defend the country “by all means.”

Both sides also faced a setback as Qatar announced it would stop trying to mediate an end to the crisis, blaming Saleh for the impasse.

This is the third month of street protests in Yemen, where a government crackdown has killed about 150 people and the president refuses to cede power.

Watch a video that is said to show protests in Yemen Friday: