Israel Radio said on Monday that Israel has evidence backing Syrian opposition accusations that forces loyal to President Bashar al-Assad used chemical weapons in Damascus last month.

The report quoted an unidentified senior Israeli defence official as saying there were two attacks on March 27, using a non-lethal "neutralising chemical weapon", east of Damascus and at another location.

Israeli government officials, asked by Reuters about the report that coincided with a meeting between Defence Minister Moshe Yaalon and Israeli media, had no immediate comment.