Thousands of people in central Italy have spent yesterday night in cars, tents and temporary shelters following the fourth earthquake in the area in three months.<br/><br/>The 6.6-magnitude quake, Italy's strongest in decades, struck close to the region where nearly 300 people were killed by a quake in August. This time no-one appears to have died in the quake near the town of Norcia, but about 20 people were injured.<br/><br/>More than 100 aftershocks were registered overnight. These included one with a magnitude of 4.2.