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Homemade explosive wounds 5 people in financial district of Colombia's capital, police say

  • Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)

    Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)  (The Associated Press)

  • Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)

    Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)  (The Associated Press)

  • Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)

    Police officers inspect an office after it was wrecked by an explosion in Bogota, Colombia, Thursday, July 2, 2015. A homemade explosive device went off in the financial district of Colombia's capital and wounded several people, while a second blast elsewhere in Bogota injured another, authorities said. (AP Photo/Fernando Vergara)  (The Associated Press)

Colombian authorities say a homemade explosive has gone off in the capital's financial district, wounding five people.

Col. Oscar Pinzon of the Bogota Metropolitan Police says there is no information on who might have set off Thursday's explosion. He describes the device as of being of medium power.

No one has claimed responsibility for the blast, which comes at a time of increased tensions between the government and the country's biggest rebel movement, the Revolutionary Armed Forces of Colombia. Both sides in Colombia's long-running conflict have been stepping up attacks in recent weeks, jeopardizing the future of 2-year-old peace talks.

The explosion happened seven blocks from U.S. Ambassador Kevin Whitaker's official residence, where he was hosting dozens of people at a reception to celebrate the Fourth of July.