UPDATE 1-China says Annan's Syria efforts more important than ever

(Recasts, adds quotes, details)

BEIJING, June 8 (Reuters) - China called on Friday for both

sides in Syria to end violence and observe a peace plan put

forward by U.N. envoy Kofi Annan, whose efforts were now more

important than ever, as the clamour grows to back tougher action

against the Syrian government.

U.N. Secretary-General Ban Ki-moon described as

"unspeakable barbarity" the reported killing of at least 78

villagers by forces loyal to Syrian President Bashar al-Assad

and warned that a civil war was imminent.

Ban said hopes for consolidating the peace plan were fading

and Annan himself warned the U.N. Security Council that the

crisis in Syria could soon spiral out of control, diplomats

said. Annan, Ban's predecessor as U.N. secretary-general, called

for "substantial pressure" on Damascus to stop the violence.

Chinese Foreign Ministry spokesman Liu Weimin did not answer

repeated questions about whether China endorses Annan's call for

substantial pressure, but said both sides in Syria should stop

the fighting.

"I think the Syrian government and opposition should both

truly shoulder their responsibility and cease fire and halt

violence," Liu told a daily news briefing. "Both sides have this

responsibility because they both undertook this commitment.

"In the current circumstances, we believe that the

importance of envoy Annan's mediation efforts has not diminished

but rather increased," he added. "The support of all sides for

the envoy Annan should strengthen, rather than weaken."

Russia and China - permanent members of the U.N. Security

Council with the power to veto resolutions - have stymied

efforts by Western powers to condemn or call for the removal of

Assad, whose forces, the U.N. says, have killed at least 10,000

people in more than a year of unrest.

"We express strong condemnation of the recent barbarity

involving attacks on innocent civilians, especially women and

children, and we hope that the perpetrators will be punished

according to the law as soon as possible," Liu said.

(Reporting by Chris Buckley; Writing by Ben Blanchard; Editing

by Nick Macfie)