Iran orders probe into attack on students: state TV

TEHRAN (Reuters) - Iran's Interior Ministry has ordered an investigation into an attack on university students which they say was carried out by Islamic militia and police.

Iran's English-language Press TV said the ministry had "called on Tehran's governor's office to identify those involved" in Sunday night's incident. It did not make clear whether the ministry itself would also look into it.

It came a day after Iran's influential speaker of parliament, Ali Larijani, condemned the attack on the dormitory of Tehran University.

One student activist who declined to be named told Reuters on Tuesday that four students -- three men and one woman -- were killed during the violence.

Tehran University Chancellor Farhad Rahbar has denied anyone was killed, the students news agency ISNA reported.

The incident took place during widespread street unrest sparked by official results showing hardline President Mahmoud Ahmadinejad won a landslide against moderate Mirhossein Mousavi in last week's election.

Thousands of students have joined protests against what they say was a rigged vote, a charge dismissed by the authorities.

Mousavi supporters, riot police and Ahmadinejad backers have clashed in the capital Tehran and elsewhere.

Hundreds of students staged a sit-in protest for a second day on Wednesday against the dormitory attack and suspected election irregularities, an activist told Reuters.

Mousavi's wife Zahra Rahnavard also condemned the incident when speaking to students, his website said.

"This brutal behavior against you is because of your drive to realize your rights," said Rahnavard, who has broken new ground in Iranian politics by actively campaigning for her husband.

Iran's most prominent university has traditionally been a hotbed of dissent, before and after the 1979 Islamic revolution.

Larijani, a conservative who has been critical of Ahmadinejad in the past, said on Tuesday the Interior Ministry should be held accountable for the university incident as it was in charge of security.

He did not say who had carried out the attack. Students told Reuters members of the religious Basij militia and plain-clothes policemen did it.

Basij is a volunteer paramilitary force fiercely loyal to Supreme Leader Ayatollah Ali Khamenei who has the final say on all matters of state in Iran.

During the past three days of violence, police have accused "bandits" of setting buses on fire, breaking windows of banks and other buildings and damaging public property.

(Reporting by Fredrik Dahl and Parisa Hafezi; editing by Philippa Fletcher)