article_snippet: One Iraqi bomb disposal expert said that the use of the chemical the chemical is a sign of desperation.
article_snippet: Haider Taher described how Haider Taher team detonated a bomb in Tikrit that, unbeknown to his team, contained chlorine.
article_snippet: his team immediately began feeling the effects of the chemical, experiencing 'painful choking' and blocked throats.
article_snippet: the BBC the BBC has been shown footage of bright yellow gas rising up from a roadside bomb explosion that the Iraqis say is chlorine, as well as film of the Tikrit explosion.
article_snippet: Used in roadside bombs such as this, in the open air, it disperses reasonably quickly and so appears to be intended to cause panic rather than serious harm.'
article_snippet: In fact, the most damage is likely to be done by the explosion created to disperse the most damage.'
article_snippet: In one attack in 1915 the gas blew back into British trenches after canisters of the chemical were fired from heavy guns at the Germans.
article_snippet: Shocking: This footage purportedly shows toxic chlorine gas which was released from a roadside bomb destroyed by Iraqi soldiers in Tikrit recently .
highlights_snippet: Bomb disposal expert says the use of the chemical is sign of desperation .
  
highlights_snippet: Video footage has emerged of yellow smoke rising up from detonations .