UN chief says Syria must prove it wants peace

By the Associated Press | April 12, 2012 | 10:06 AM EDT

In this image made from amateur video released by the Shaam News Network and accessed Thursday, April 12, 2012, purports to show a Syrian military armored vehicle in Idlib, Syria. Syrian forces halted attacks on opposition strongholds Thursday in line with a U.N.-brokered truce but the regime defied demands by international envoy Kofi Annan to pull troops back to their barracks, activists said. (AP Photo/Shaam News Network via AP video) TV OUT, THE ASSOCIATED PRESS CANNOT INDEPENDENTLY VERIFY THE CONTENT, DATE, LOCATION OR AUTHENTICITY OF THIS MATERIAL

GENEVA (AP) — The U.N. chief says the "onus is on Syria" to keep the government's promise and hold to a cease-fire.

Ban Ki-moon says that "as of this moment, the situation looks calmer" on the ground in Syria but that the cease-fire Thursday is "very fragile" and may be broken anytime.

He tells reporters that it may take just a gunshot to derail peace.

Ban told reporters Thursday in Geneva that "the world is watching, however, with skeptical eyes, since many promises previously made by the government of Syria have not been kept."

He says the government must that its "words will be matched by their deeds."

A fragile cease-fire brokered by the U.N. took hold in Syria on Thursday.

Regime forces apparently halted widespread attacks on the opposition.