(AGI) Washington, July 5 - Four children were killed andseveral people injured when a massive fire destroyed numerousrow-houses in Philadelphia. The blaze started in one of thehomes and then spread quickly to the others. A set of4-year-old twins, a boy of the same age and 1-month-old babywere killed in the fire, according to the local media.Investigators have not yet revealed their identities. A womanand two 11-year-old children were also hurt; 42 people havebeen displaced and are currently staying at a local school. . .