TAUNTON, Mass. — Authorities say a Massachusetts woman is lucky to be alive after her home exploded and burst into flames.Police say 52-year-old Laurie Beliveau escaped her Taunton home unscathed late Sunday afternoon.The blaze destroyed the single-family home after firefighters arrived. The flames have since been extinguishedA spokesman for Columbia Gas of Massachusetts says that a gas leak or a similar malfunction is possible.The Boston Globe reported that State Fire Marshal Stephen Coan confirmed that gas was involved.