In this June 5, 2014, file photo, a man rides a bicycle through a devastated part of Homs, Syria.

U.S. officials say the United States and Russia have agreed on a plan that would create a cease-fire in Syria starting Saturday.

The officials said Monday that the two sides have agreed on the terms and conditions for the “cessation of hostilities,” as they call it.

The truce excludes attacks on the ISIS group and the Nusra Front, al-Qaeda’s local affiliate.

An announcement is expected after Presidents Barack Obama and Vladimir Putin speak on the matter by telephone

Meanwhile, the leader of a Saudi-backed Syrian opposition alliance said that rebel factions have agreed “in principle” to an internationally mediated temporary truce.

Riad Hijab, who heads the group known as the High Negotiations Committee, also called on Russia, Iran and the Syrian government to stop their attacks, lift blockades and release prisoners in Syria.

His statement on Monday did not elaborate on the terms of the truce reached.

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