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VOLGOGRAD, Russia — Eerily empty buses lumbered through the streets, police weighed down with body armor warily watched pedestrians near a fast-food restaurant, and members of Cossack units stood guard at bus stops. Volgograd was an ominous and jittery city Tuesday, after two suicide bombings in two days killed 34 people.

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LONDON (AP) — With more than 30 marathons being held this weekend alone and big events on the horizon, officials around the world are boosting security efforts in the wake of the fatal bomb blasts that shook Boston’s race.