TEHRAN , Iran ( CNN ) -- Iranian security forces blamed a privately owned vehicle Thursday for allegedly running into protesters during Sunday 's opposition protests on a Shiite Muslim holy day , according to a news agency . `` There were no deaths resulting from a car accident in the Vali-e Asr area . We referred to the fact in our previous statement that a privately owned Patrol vehicle hit a number of rioters on Azadi [ Freedom ] Street between Roudaki and Khosh Streets , '' said the semi-official Iranian Labour News Agency , referring to a model of car made by Nissan . `` The vehicle was traced by the security forces and the case is being investigated , '' ILNA said . At least seven people were killed Sunday -- the Shiite Muslim holy day Ashura -- as anti-government protests turned violent . The Iranian government denies that any of the deaths were caused by official security forces , but the clashes -- depicted in sometimes grainy and shaky amateur videos -- show a number of protesters with serious and possibly fatal injuries , including some with apparent gunshot wounds . In one video -- shot Sunday , according to the posting on the Web site YouTube -- green-and-white police trucks rush into crowds of demonstrators in Tehran . The protesters scatter in all directions , but one truck drives into a group trapped in a narrow street with a wall on one side and parked cars on the other . The camera follows the truck , which appears to be a police truck , as it backs away , but a person briefly can be seen crumpled in the street where the truck had been . When the camera returns to the spot , another truck drives over the person . Other protesters rush to the downed person 's aid . It is not clear whether the person was killed . CNN can not confirm the authenticity of the video , or another one obtained by CNN that shows a woman who was said to have been killed when hit by a car driven by members of the Basij , the Iranian paramilitary group . ILNA said it released the statement Thursday from security forces `` owing to the fact that a film has been shown by foreign and anti-revolution [ news ] networks regarding a vehicle similar to those used by Security Forces being involved in hitting a man at the Vali-e Asr Square . '' `` Since the film may be a fake , which is the way foreign and anti-revolution media work , the case is being investigated . '' Iran 's chief prosecutor , Abbas Jafari Dolatabadi , told reporters this week that seven people where killed in Sunday 's clashes on the holiday of Ashura . Most died after being struck with `` hard objects or due to similar causes , '' Dolatabadi said . Opposition leader Mir Hossein Moussavi 's nephew , Seyyed Ali Moussavi , died from a gunshot wound on Sunday . The elder Moussavi 's Web site said he was killed during the demonstrations , but state-run news agencies said that Moussavi 's death was not connected to the Ashura protests but `` had been planned in suspicious circumstances . '' Sunday 's clashes were the worst since opposition protesters took to the streets for days following the disputed June 12 presidential election . At least eight people were killed during those protests . Ashura commemorates the martyrdom of Imam Hussein , the grandson of the Prophet Mohammed , who was killed in battle in Karbala in 680 A.D. CNN 's Shirzad Bozorgmehr contributed to this report .
Video 's posters say it shows Iranian police driving into crowds of demonstrators . Truck drives over person in video , which posters say was recorded Sunday . Comment: