TEHRAN Iran's rebel group said it had fired rocket-propelled grenades on Monday at a police station in the capital Tehran, near a high-security area where several Iranian leaders live.

But journalists who visited the area said there was no visible sign of damage at the police building. Police denied any attack had taken place.

A spokesman for the Iraq-based MKO told Reuters in Dubai that the attack had inflicted "heavy damage and casualties" on the police station in the northern suburb of Shemiran.

The Mojahedin said the raid was the 14th it had launched in retaliation to Iran's missile attack on the group's bases in Iraq on Wednesday.

Iraq has said Iran fired 56 Scud missiles at Mojahedin camps, killing six people and wounding several others. The group has said one of its members had been killed.

Iran said the strike was in self-defense against Mojahedin attacks and threatened to launch more strikes against rebel bases in Iraq unless they ceased cross-border raids and attacks deep inside the Islamic Republic.

Tehran regularly criticizes the Iraqi government for backing the Mojahedin.

Iraq in turn accuses Iran of sheltering Iraqi Shi'ite Muslim dissidents.

The two countries fought a ruinous war from 1980 to 1988 and still have bitter disagreements over many issues including the repatriation of prisoners of war.