Students protesting Riyadh's military assault on Yemeni Shias in front the Iranian Foreign Ministry have called for the expulsion of the Saudi ambassador, Press TV reported.
The university students, who were demonstrating for the second consecutive day on Tuesday, made the demand in a letter addressed to President Mahmoud Ahmadinejad.
"Tuesday is the anniversary of the (1987) killing of pilgrims, an act of state terrorism carried out by the forces of the oppressive Al Saud government, which is the main base of American Islam in the region," said the letter.
The students who have gathered in Tehran from all over the country despite the cold weather in the capital plan to continue their sit-in until Wednesday.
One of the organizers of the event told IRNA that the students were there to show their anger at what they believed was a war planned by "Zionist" entities.
"The Zionists have instigated many wars in places like Afghanistan, Iraq and the Gaza Strip to cover their own losses," student spokesman Esmail Tahmouresi said.
"In the war against Shia Muslims in northern Yemen Saudi Arabia has become the perpetrator of the Zionist's colonialist plans," he added.
The conflict in northern Yemen first began in 2004 between Sana'a and Houthi fighters, but relative peace had returned to region until August 11, when the Yemeni army began a major offensive, dubbed Operation Scorched Earth, against the province of Sa'adah.
The government claims that the fighters, who are named after their leader Abdul Malik al-Houthi, seek to restore the Shia Zaidi imamate system, which was overthrown in a 1962 coup.
The Houthis, however, say they are defending their people against government marginalization policies which they believe have been adopted under pressure from Saudi-backed Wahhabi extremists, who consider Shias heretics.
Recently, the Saudi Arabian government has aggravated the situation even more by launching its own offensive against northern Yemen based on an allegation that Houthi fighters have killed two of its soldiers on the border.
While Riyadh insists that it is targeting Houthi positions on 'Saudi territory', the fighters say Yemeni villages are being targeted with deadly phosphorous bombs, which cause massive injuries among the Shia civilian population.
As Sana'a does not allow independent media into the conflict zone, there are no clear estimates available as to how many people have been killed in the Shia province of Sa'adah since the beginning of the unrest in 2004 or in the recent violence.
The UN High Commissioner for Refugees (UNHCR), however, estimates that since 2004 up to 175,000 people have been forced to leave their homes in Sa'adah to take refuge in overcrowded camps set up by the United Nations.
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