* Security forces open fire on Homs funeral, suburb protest
* Syria blames armed groups for violence
* Friday prayers rallying point for protests
(Updates with protester killed in Saqba)
By Khaled Yacoub Oweis
AMMAN, May 21 (Reuters) - Syrian security forces shot dead a mourner in the central city of Homs on Saturday and wounded many more at a mass funeral for people killed in the latest crackdown on protests against President Bashar al-Assad, a witness said.
The funeral at Nasr cemetery, during which mourners shouted "overthrow the regime", was for 10 demonstrators killed by security forces in Homs on Friday, said the witness, who was at the funeral and spoke to Reuters by telephone.
Tens of mourners were wounded, he said, adding that he saw five people with gunshot wounds in their legs and arms being taken to hospital.
Security forces killed another protester, named Ziad al-Qadi, when they fired live rounds at a demonstration in the Damascus suburb of Saqba, a witness said by telephone from the suburb of 40,000.
"A large demonstration calling for the overthrow of the regime had been going on since the afternoon. It felt like the whole of Saqba took to the streets. Security forces entered in the evening and started firing," said the witness.
Syria has barred most international media since the protests broke out two months ago, making it impossible to verify independently accounts from activists and officials.
The latest violence came as the Syrian National Organisation for Human Rights said security forces had killed at least 44 civilians on Friday in attacks on pro-democracy demonstrations across Syria.
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Prominent rights campaigner Ammar Qurabi, who heads of the organisation, said more than half were killed in the northwest province of Idlib, where tanks deployed on Friday to crush large demonstrations against Assad's rule.
The protests broke out in defiance of a military crackdown that another rights group says has killed more than 800 civilians in the past nine weeks.
Assad has largely dismissed the protests as serving a foreign-backed conspiracy to sow sectarian strife.
Syrian authorities blame most of the violence on armed groups, backed by Islamists and outside powers, who they say have killed more than 120 soldiers and police. They have recently suggested they believe the protests have peaked.
Syria said on Saturday armed groups killed 17 people on Friday in the provinces of Idlib and Homs to the south.
The state news agency said the civilians, police and security forces were killed after armed groups exploited the commitment of police forces to instructions by the Interior Ministry "not to shoot, to preserve the lives of civilians".
It said saboteurs burnt public buildings and police stations in Idlib, injuring eight policemen.
U.S. CRITICISM
The unrest has posed the gravest challenge to Assad's rule. In response, he has lifted a 48-year state of emergency and granted citizenship to stateless Kurds, but also sent tanks to several cities to suppress the protests.
Friday's violence came a day after the United States, which had at first muted its criticism Assad's handling of the unrest, told him to lead reform or step aside.
"The president can still try to redeem himself by doing what a few leaders in Eastern Europe did, which is leading immediate transformation to a democracy and running himself in a fair elections if he wants," opposition figure Walid al-Bunni said.
"With all the blood the regime is spilling the protests have been growing and expanding in geographical scope ... The Syrians have been humiliated and they will no longer shut up," he added.
The main weekly Muslim prayers on Fridays are a rallying point for protesters because they offer the only opportunity for large gatherings, and have seen the worst death tolls.
Activists said protests broke out on Friday in the Damascus suburbs, Banias and Latakia on the Mediterranean, the oil producing region of Deir al-Zor, Qamishli in the east and the southern Hauran Plain.
Syrian human rights lawyer Razan Zaitouna said on Friday at least 12 civilians were killed in Maaret al-Numan, in Idlib province, after tanks entered the town to disperse protesters. She said 11 were killed in the central city of Homs, while seven died in Deraa, Latakia, the Damascus suburbs and Hama.
Rights campaigners said Idlib, a relatively prosperous agricultural province, took the brunt of the crackdown on Friday, during which hundreds of Syrians were arrested.
They said those killed included at least five protesters shot by security forces while they were marching from the town of Ariha to join other protests in Idlib.
"They took their dead and went back to Ariha and burnt security and Baath Party headquarters and a Syriatel office," said one rights campaigner in the area.
Syriatel, Syria's largest mobile phone operator, belongs to Assad's cousin Rami Makhlouf, who has expanded his control on various sectors of the economy since Assad succeeded his late father 11 years ago.
Some protesters called on Friday for freedom, activists said. Others demanded "the overthrow of the regime", the slogan of uprisings which toppled leaders in Egypt and Tunisia. (Writing by Dominic Evans and Yara Bayoumy; Editing by Jon Boyle)
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