At least 14,115 people, the majority civilians, have been killed in Syria since the start of the revolt against the regime of President Bashar al-Assad, according to the Syrian Observatory for Human Rights.
9,862 civilians, 3,470 soldiers and 783 army deserters have died, the Britain-based watchdog said.
The Observatory counts rebel fighters who are not deserters from the army as civilians.
The violence has intensified in Syria despite the presence of 300 United Nations observers charged with monitoring a truce that was supposed to take effect from 12 April.
Yesterday, at least 111 people - 83 civilians and 28 soldiers - were killed, according to revised figures from the Observatory, representing one of the heaviest single-day death tolls since the nominal start of the ceasefire.
Reports from the conflict cannot be verified as the Syrian government has barred the international media from the country.
Separately, the opposition Syrian National Council has said it had elected Kurdish activist Abdel Basset Sayda as its new leader at a meeting in Istanbul.
"Abdel Basset Sayda has been elected president of the Syrian National Council as successor to Dr Burhan Ghalioun," a brief statement said.
He takes over from Paris-based academic Dr Ghalioun, the exiled bloc's first leader who stepped down last month in the face of mounting splits that were undermining the group's credibility.
Activists accused Dr Ghalioun of ignoring the Local Co-ordination Committees, which spearhead anti-government protests on the ground in Syria, and of giving the Muslim Brotherhood too big a role.
Mr Sayda, who has lived in exile in Sweden for two decades, is seen as a consensus candidate capable of reconciling the rival factions within the SNC and of broadening its appeal among Syria's myriad of ethnic and confessional groups.
Born in 1956 in Amuda, a mostly Kurdish city in northeastern Syria, Mr Sayda is an expert in ancient civilisations and author of a number of books on Syria's Kurdish minority but is Arabic educated.
He does not belong to any political party and his name is not familiar to many Syrians but SNC officials say he is a "conciliatory" figure, "honest" and "independent".
The SNC has been criticised for not representing the full diversity of Arabs, Kurds, Sunni Muslims, Alawites, Christians, Druze and other ethnic and religious groups in Syria.
Syria's Kurds represent around 9% of Syria's 23 million population. Most of them live in the north of the country and in Damascus.
They complain of persistent discrimination, and demand recognition for their Kurdish culture and language, and that they be treated as full-fledged citizens.
A dozen Kurdish political groups are banned by Syrian authorities.
