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Improvised bomb injures 22 on London subway train

LONDON — A homemade bomb exploded on a packed London subway train during rush hour on Friday, leaving 22 people injured, police and health officials said. None of the injured is thought to be seriously hurt.

Police say the explosion was a terrorist attack, the fifth in Britain this year. Britain’s domestic spy agency is helping out in the investigation.

Ash species on brink of extinction

NEW YORK—Five prominent species of ash tree in the eastern U.S. have been driven to the brink of extinction from years of lethal attack by a beetle, a scientific group says.

Tens of millions of trees in the U.S. and Canada already have succumbed, and the toll eventually may reach more than eight billion, the International Union for Conservation of Nature said today.