Ban has asked the Syrian government to allow a team of UN weapons inspectors to investigate the latest incident in Damascus, BBC reports.
He said that the disarmament chief, Angela Kane, will press for an investigation.
Experts have claimed that a nerve agent might have been used in the attack, the report added.
But the government, which denied the allegations, has given no indication that it will allow this.
The latest chemical attack has drawn global criticism.
However, the Syrian government has described the latest allegations as illogical and fabricated, the report added.
Opposition activists revealed that more than 1,000 people were killed after government forces launched rockets with toxic agents into the Damascus suburbs in the Ghouta region on Wednesday trying to drive out rebel forces.
--ANI (Posted on 24-08-2013)