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Intense clashes in Syria's Aleppo as insurgents attack government-held neighborhood

  • In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday, July 7, 2015, a tank from the Nusra Front fires during their clashes against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Intense clashes broke out in the northern Syrian city of Aleppo after militants attacked the government-held neighborhood, capturing several buildings, activists said. (Al-Nusra Front Twitter page via AP)

    In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday, July 7, 2015, a tank from the Nusra Front fires during their clashes against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Intense clashes broke out in the northern Syrian city of Aleppo after militants attacked the government-held neighborhood, capturing several buildings, activists said. (Al-Nusra Front Twitter page via AP)  (The Associated Press)

  • In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday July 7, 2015, one of the leaders of the Nusra Front, center left, explains to his fighters an attack plan against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Intense clashes broke out in the northern Syrian city of Aleppo after militants attacked the government-held neighborhood, capturing several buildings, activists said. (Al-Nusra Front via AP)

    In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday July 7, 2015, one of the leaders of the Nusra Front, center left, explains to his fighters an attack plan against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Intense clashes broke out in the northern Syrian city of Aleppo after militants attacked the government-held neighborhood, capturing several buildings, activists said. (Al-Nusra Front via AP)  (The Associated Press)

  • In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday, July 7, 2015, a fighter from the Nusra Front fires a weapon during clashes against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Opposition fighters and Islamic militants have launched a series of attacks in Aleppo since last week, capturing the city's Scientific Research Center that was used as a military base. Activists said Syrian troops and pro-government gunmen have been trying to retake the base with no luck so far. (Al-Nusra Front via AP)

    In this image posted on the Twitter page of Syria's al-Qaida-linked Nusra Front on early Tuesday, July 7, 2015, a fighter from the Nusra Front fires a weapon during clashes against the Syrian government forces at the western Zahra neighborhood in Aleppo city, Syria. Opposition fighters and Islamic militants have launched a series of attacks in Aleppo since last week, capturing the city's Scientific Research Center that was used as a military base. Activists said Syrian troops and pro-government gunmen have been trying to retake the base with no luck so far. (Al-Nusra Front via AP)  (The Associated Press)

Activists say there are intense clashes in the northern Syrian city of Aleppo after militants attacked a government-held neighborhood, capturing several buildings.

The Local Coordination Committees and the Aleppo Media Center say Tuesday's fighting is concentrated in the western Zahra neighborhood.

Opposition fighters and Islamic militants have launched a series of attacks in Aleppo since last week capturing the city's Scientific Research Center that was used as a military base.

The LCC and the Britain-based Syrian Observatory for Human Rights say the attack on Zahra started Monday night with a large explosion that killed government troops and pro-government gunmen.

The Observatory says it was a suicide attack carried out by a member of al-Qaida's branch in Syria, the Nusra Front. It says the blast killed 25 troops and pro-government gunmen.