Reuters - The arrival of international chemical weapons inspectors at the location of a suspected poison gas attack in the Syrian town of Douma has been delayed after gunfire at the site during a visit by a U.N. security team on Tuesday, sources told Reuters.

The U.N. security team entered Douma to assess the situation ahead of the planned visit by inspectors from the Organisation for the Prohibition of Chemical Weapons (OPCW), said the sources, who had been briefed on the team’s deployment.

The OPCW inspectors are in Syria to investigate an April 7 incident in which Western countries and rescue workers say scores of civilians were gassed to death by government forces, which Damascus denies.