An earthquake of magnitude 6.4 struck central Croatia on Tuesday, killing seven people, injuring more than 20 and rattling several neighbouring countries, officials and residents said.<br /><br />Rescuers pulled people from the rubble of collapsed buildings in Petrinja and other towns, and army troops were sent to the area to help.<br /><br />Tremors were also felt in Croatia's capital Zagreb and as far away as Austria's capital Vienna. Slovenia shut its only nuclear power plant as a precaution.
