Opposition activists again accused President Bashar al-Assad's forces of using poison gas in Syria's civil war on Thursday, showing footage of an apparently unconscious man lying on a bed and being treated by medics, Reuters reported. The alleged attack on the neighbourhood of Jobar in the capital Damascus comes a week after the Syrian government sent a letter to the United Nations claiming it had evidence that rebel groups were planning a toxic gas attack in the same area. Reuters could not independently verify the footage or the claims due to security restrictions on reporting in Syria. Activists from the opposition 'Jobar Revo' group posted the video on YouTube of a man being treated with oxygen and being injected by medics. A voice off-screen said Thursday's date and that there was 'a poison attack in Jobar.' Another opposition group, the Syrian Revolutionary Coordinators Union, said that all those affected by the gas were 'in a good condition'. There has been on-off fighting between rebels and government forces in Jobar this year.