Chemical weapons used in two incidents in Syria last year appear to come from the stockpiles of the Syrian military, United Nations human rights investigators said on Wednesday in a report that went beyond previous findings.

The team of independent experts, led by Brazilian Paulo Pinheiro, said that so far they had confirmed the deadly nerve agent sarin was used in three incidents: the Damascus suburb of al-Ghouta on August 21, in Khan al-Assal near Aleppo in March 2013 and in Saraqeb near the northern town of Idlib last April.

The first two attacks bore “the same unique hallmarks”, according to the team of some two dozen investigators who include a military advisor. […]