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Thousands of police, troops tighten security in Russian city hit by 2 suicide bombings

  • A women puts a flower outside a wreckage of a trolleybus in Volgograd, Russia, Tuesday, Dec. 31, 2013. Russian authorities ordered police to beef up security at train stations and other facilities across the country after a suicide bomber killed 14 people on a bus Monday in the southern city of Volgograd. It was the second deadly attack in two days on the city that lies just 400 miles (650 kilometers) from the site of the 2014 Winter Olympics. (AP Photo/Denis Tyrin)

    A women puts a flower outside a wreckage of a trolleybus in Volgograd, Russia, Tuesday, Dec. 31, 2013. Russian authorities ordered police to beef up security at train stations and other facilities across the country after a suicide bomber killed 14 people on a bus Monday in the southern city of Volgograd. It was the second deadly attack in two days on the city that lies just 400 miles (650 kilometers) from the site of the 2014 Winter Olympics. (AP Photo/Denis Tyrin)  (The Associated Press)

  • Flowers and toys are placed at the site of a trolleybus bombing in Volgograd, Russia, Tuesday, Dec. 31, 2013. Russian authorities ordered police to beef up security at train stations and other facilities across the country after a suicide bomber killed 14 people on a bus Monday in the southern city of Volgograd. It was the second deadly attack in two days on the city that lies just 400 miles (650 kilometers) from the site of the 2014 Winter Olympics. (AP Photo/Denis Tyrin)

    Flowers and toys are placed at the site of a trolleybus bombing in Volgograd, Russia, Tuesday, Dec. 31, 2013. Russian authorities ordered police to beef up security at train stations and other facilities across the country after a suicide bomber killed 14 people on a bus Monday in the southern city of Volgograd. It was the second deadly attack in two days on the city that lies just 400 miles (650 kilometers) from the site of the 2014 Winter Olympics. (AP Photo/Denis Tyrin)  (The Associated Press)

Thousands of police officers and paramilitary forces are on duty in the Russian city of Volgograd, which is reeling from two suicide bombings in two days that killed 33 people and raised fears that a terrorist campaign may have begun that could stretch into the Winter Olympics.

In the wake of Sunday's bombing at the city's main railway station and Monday's blast on a trolleybus, police reinforcements and Interior Ministry troops have been sent into the city, regional police official Andrei Pilipchuk was quoted as telling the Interfax news agency. He says more than 5,200 security forces are deployed.

The Emergencies Ministry said two more victims died on Tuesday, raising the toll to 33 — 18 from the station bombing and 15 from the bus.