Iranian residents - still terrified from Saturday' massive earthquake -were jolted again early Tuesday morning.

Just days after being devastated by a killer earthquake measuring 6.3 on the Richter scale, northwestern Iran was shaken again - this time with a magnitude 4.0 temblor.

The quake struck shortly after midnight Tuesday. hitting parts of Qazvin Province - the same area that was hit Saturday morning. That temblor killed more than 200 people, leveled thousands of houses and buildings and left tens of thousands of people homeless.

The Islamic Republic News Agency says there were no new reports of deaths or injuries as a result of the latest quake, which was followed by several aftershocks.

Many residents, terrified by Saturday's earthquake, had been sleeping outside, fearing their homes would collapse.

Iran is one of the world's most quake-prone regions. Since 1990, more than 41,000 people have been killed in three major earthquakes there.

Iranian President Mohammad Khatami is scheduled to travel to the quake-hit areas Tuesday. There have been offers of help from the United States, the United Nations, several European countries and Pope John Paul II.