A Holyoke man charged with shooting at pedestrians crossing a city bridge has been ordered held without bail. Edgar Zayas, 19, pleaded not guilty Monday in Holyoke District Court to four counts each of armed assault to murder and assault with a dangerous weapon, as well as firearms charges. A dangerousness hearing is set for Wednesday. Police said Zayas was arrested after a standoff with police on the Vietnam Veterans Memorial Bridge at about 9 p.m. Saturday. Pedestrians on the bridge between Holyoke and South Hadley told police they were shot at. There were no reports of injuries. Police said Zayas had taken angel dust and wanted police to shoot him.