Monday, July 12, 1999 Published at 17:47 GMT 18:47 UK
World: Middle East
Renewed clashes in Tehran
Iranians weep during an speech by Ayatollah Khamenei on Monday
Thousands of demonstrators have clashed with riot police in Tehran on the fifth day of the worst unrest since the 1979 Islamic Revolution.
An estimated 10,000 pro-democracy protesters gathered at the city's university on Monday, shouting "Death to dictatorship!"
According to eyewitnesses, police beat the students with sticks and used tear gas to drive them back. Some reports said that hundreds of local residents and passers-by joined in the demonstrations.
Thousands of other students remain barricaded inside the university campus, whose gates have been shut. Flames from a large fire could be seen from outside the campus.
Witnesses also said a shot was fired outside the university's central mosque, sending thousands of demonstrators spilling on to the campus.
Ayatollah Khamenei denounced the police raid that killed one student on Thursday as "unacceptable''. "This bitter incident hurt my heart," he was quoted as saying.
"In the Islamic system it is not acceptable at all to attack the house and shelter of a group, particularly overnight or at the time of congregation prayers," he added.
Ayatollah Khamenei is identified with Iran's hardline conservatives opposed to reformist President Muhammad Khatami who is supported by the students.
The Supreme Leader's remarks, quoted by the official IRNA news agency, are his first public reaction to the pro-democracy protests and follow allegations by the students that he was complicit in the police action.
The protests continued on Monday despite a warning from Iran's National Security Council that demonstrations now require authorisation.
They are calling for the dismissal of Iran's hardline police chief, General Hedeyat Lotfian, and for control of law-enforcement agencies to be transferred from the Islamic authorities to President Khatami.
Reports said protesters threw stones at police who retaliated with batons.
Two senior police officers have been dismissed and detained for ordering Thursday's raid.
The Iranian news agency said on Monday that ''dozens of students'' had been injured and many others arrested in the recent unrest.
As the protests have grown and spread to cities outside Tehran they have become increasingly critical of Iran's Islamic authorities.
The BBC Middle East correspondent says the unprecedented demonstrations have given President Khatami's hardline opponents a glimpse of what might happen if they continue to obstruct peaceful reform.
More than 500 journalists working for pro-reform newspapers are planning a one-day strike against the closure of the Salam newspaper - which sparked the protests - on Tuesday.