Updated

Russia's foreign minister has asserted that a suspected chemical attack in the Syrian town of Douma last weekend was fabricated with the help of an unspecified foreign intelligence agency.

Sergey Lavrov says Russian experts have inspected the site of the alleged attack in Douma, just east of Damascus, and found no trace of chemical weapons. He says Moscow has "irrefutable information that it was another fabrication."

Lavrov spoke to reporters in Moscow on Friday.

He said that "intelligence agencies of a state that is now striving to spearhead a Russo-phobic campaign were involved in that fabrication." He didn't elaborate or name the state.

The attack has drawn international outrage and prompted the United States and its allies to consider a military strike on Syria, something Moscow has strongly warned against.