His comments came after he said that the British photographer wounded escaped from Homs last week he saw the Syrian forces committed a massacre in the Santa Amr city, which has become a symbol of the uprising began a year ago against President Bashar al-Assad.
Opposition activists told Reuters that Syrian forces bombed the area for weeks began to hunt and kill opposing fighters who stayed to cover the retreat of the rebels on Thursday.
He said opponents of the withdrawal of a major setback for armed revolution, which began peaceful protests largely inspired by the "Arab spring", but intensified after government repression as long.
He said that before the General Assembly of the United Nations consisting of 193 countries on Friday, "There was a big attack on Homs yesterday ... it is clear that the human cost is huge. We continue to receive reports of gruesome executions without trial, arbitrary arrests and torture."
In some of the strongest criticism of Damascus said that so far, "This brutal attack appalling larger offensive that the government itself systematically attack its own people."
The Syrian ambassador to the United Nations, Bashar Jaafari, in response to comments that the Secretary-General's remarks involve "malicious tone is very limited to slander the government based on reports and opinions, or rumors."
Jaafari said that "false allegations made by the opposition or from people abroad or people who live in countries hostile to Syria openly."
He added that "The secretary general is familiar with the way things should be" and reiterated that the Syrian opposition consists of "an armed terrorist groups."
The International Committee of the Red Cross aid convoy arrived at the Baba Amr, but was not allowed to enter.
Jakob Kellenberger, said Chairman of the Committee in a statement in Geneva "It is unacceptable for lack of need for emergency assistance weeks ago any support yet.
"We're staying the night in Homs in the hope of entering Baba Amr at the earliest. Addition, many families fled from Pope Amr, We will help them as soon as we can."
He is active in Homs, told Reuters, "the Syrian army disrupt the convoy because they want to clean the Pope Amr after what they did there."
Could not be verified independently.
The activist said "all of the remaining men in the neighborhood between 14 and 50, were arrested. Afraid to be killed. Where the world .."
He informed the Pope left the last active Amr on Friday, Reuters via Skype-mail "massacres continue. Torture them and kill (the detainees), and one after the other. Executing them in groups."
The activists said that many of the fighters were from 2000 in Baba Amr killed and wounded in the attack, adding that it is not possible to determine the number of final total because of heavy shelling and siege. There were reports the flight of hundreds.
A British photographer Paul Conroy, who fled from Homs last week after injuring his leg during the bombardment that the city was being bombed daily random.
Conroy told the Sunday Times photographer told Sky News from a bed in a hospital in central London, "I worked in many war zones did not see at all, or I'm having such a bombardment.
"I was a former artillery soldier and then continue my patterns to some extent .. they were moving through the neighborhoods munitions used on the battlefield.
"It's not a war it's a massacre random massacre of men, women and children."
He said that thousands of people are still without electricity in Homs or water and without hardly any food.
The Syrian government said on Friday it would like to express sorrow and regret for the killing of U.S. journalist Marie Colvin who was killed last week in the besieged city of Homs.
The prosecutor's office said in Paris on Friday it had opened a preliminary investigation in the commission of the crime of murder and attempted murder in the bombing which also killed French photographer Remy Aohleyk and wounded journalist Edith Bouvier seriously injured.
The television footage showed protesters out into the streets after Friday prayers in the towns and cities across Syria including Homs, Hama, Deir Al-Zour and shield and Duma and several neighborhoods in Damascus.
The Syrian Observatory for Human Rights, based in London, said at least 13 people were killed Friday when security forces fired mortar bombs at the protest in the town of Homs Governorate Rastan.
It is very difficult to verify such reports independently because the Syrian authorities to prevent foreign media from entering.
In Geneva, the Human Rights Council said the UN's al-Assad of its obligations under international law.
Said Rupert Colville, spokesman for the Council "We are concerned of reports coming out from the neighborhood of Baba Amr in Homs, after government troops took control of it yesterday."
Conditions have worsened sharply in the region that came under heavy shelling. The television footage showed heavy snow and the temperature dropped sharply, while the population is not available fuel or electricity required for heating. There is also a shortage of food and medical supplies.
The United Nations says that Syrian forces had killed more than 7,500 civilians since the uprising began in March.
The Syrian government said in December that "armed terrorists" were killed over two thousand military personnel and police during the unrest.
Source: Reuters