A string of powerful bomb explosions rocked three Madrid railway stations today just days before Spain’s general election, killing at least 131 rush-hour commuters and injuring hundreds more in what officials called the deadliest attack ever by the Basque separatist group ETA.

A string of powerful explosions rocked several Madrid railway stations on the eve of Spain’s general elections, killing at least 30 people in what could be the deadliest attack ever by the Basque separatist group ETA.