Toronto police officers are trying to identify a suspect after a Facebook Marketplace seller was sprayed with a noxious substance during a robbery attempt.It happened on Friday, August 7, in the Coxwell Avenue and Gerrard Street East area.Investigators say a man responded to an online ad and agreed to meet the seller at around 8:40 p.m.But instead of buying the product, police allege the man sprayed the seller with a noxious substance and attempted to steal the item for sale.The suspect wasn’t successful, though, and police say he fled the area empty-handed.No serious injuries were reported.The suspect is described as 18 years old, around six feet tall with long curly hair. He was last seen wearing black pants and a black sweater.