Residents gather at the ruins of a house struck by a mortar bomb during an operation in Goma
REFILE - ADDING TAGS Residents gather at the ruins of a house struck by a mortar bomb during an operation in Goma town in the eastern Democratic Republic of Congo August 28, 2013. A U.N. peacekeeper from Tanzania was killed and three others were wounded on Wednesday in the operation with the Congolese army to drive back M23 rebels from the city of Goma in eastern Congo, a U.N spokesman said. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: CIVIL UNREST POLITICS)
U.N. helicopters attack M23 rebels in eastern Congo
A 3,000-strong U.N. intervention brigade, with a tough new mandate to protect civilians and neutralise armed groups, sprang into action last week after it accused the M23 rebels of shelling Goma
Wounded Congolese army fighter rests inside a ward as he receives treatment at the HEAL Africa teaching hospital in Goma in the eastern DRC
A wounded Congolese army fighter rests inside a ward as he receives treatment at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: CIVIL UNREST HEALTH MILITARY)
Wounded Congolese army fighters rest inside a ward as they receive treatment at the HEAL Africa teaching hospital in Goma in the eastern DRC
Wounded Congolese army fighters rest inside a ward as they receive treatment at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo, August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: SOCIETY CIVIL UNREST HEALTH MILITARY)
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern DRC
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo, August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: SOCIETY CIVIL UNREST HEALTH MILITARY)
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern DRC
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: SOCIETY CIVIL UNREST HEALTH MILITARY) TEMPLATE OUT
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern DRC
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: CIVIL UNREST MILITARY HEALTH POLITICS)
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma
Wounded Congolese army fighters receive treatment inside a ward at the HEAL Africa teaching hospital in Goma in the eastern Democratic Republic of Congo August 27, 2013. A U.N. brigade tasked with neutralising armed groups in Congo has assisted the country's army in clashes with eastern rebels on Monday, ending a brief lull in days of fighting that has killed and wounded dozens. The violence, the most serious in months, is the first major test for the newly deployed U.N. Intervention Brigade which has an unprecedented mandate to launch military operations against M23, one of the rebels at the heart of nearly two decades of conflict. REUTERS/Thomas Mukoya (DEMOCRATIC REPUBLIC OF CONGO - Tags: CIVIL UNREST CRIME LAW HEALTH POLITICS MILITARY)
Congo army battles M23 rebels near eastern city of Goma
Several shells fell in Rwanda during clashes around Goma last week, prompting Kigali to accuse Kinshasa of bombing it. Congo denied the charge and accused Rwandan troops of backing the rebels
UN Intervention Brigade fires on Congo rebel positions
The United Nations has pledged to prevent the rebels from getting back within range of the city of about a million people on the Rwandan border