DENVER -- A Massachusetts man is so far the only person arrested during the week of the Democratic National Convention in Denver who is facing charges of attempting to use a feces-filled bottle as a weapon.

A Denver County Court complaint indicates Zachary Patrick Grey, 22, of Marion, Mass., was arrested Monday following a foot chase.

The Denver Post reported that Grey dropped the bottle while he was running, but that police said he was getting ready to throw it.

Grey said the bottle contained coffee with soy milk, not feces. He said he wasn't protesting anything at the time he was arrested.

Police said the contents of the bottle smelled bad.

The Denver City Council passed an ordinance earlier this month barring protesters from carrying irritants or feces for use as protest material during the convention.