Thirty-seven people including women and children were killed in Democratic Republic of Congo's eastern region of South Kivu following an attack early on Saturday morning, according to a witness.
The victims had been shot, stabbed or burned inside their homes. Some of the bodies lay inside a village church, according to a Reuters cameraman on the scene.
South Kivu governor Marcellin Cishambo confirmed the attack, but gave a lower estimate of 27 for the number of dead.
Fans in Kinshasa grew angry on Sunday evening after their local team was defeated 1-0 by a team from the eastern town of Lubumbashi in a heated final, according to the local minister for the capital's inner city.
"Four policemen were harassed by supporters. When they fired tear gas, the stampede began, causing the deaths," Emmanuel Akweti told Reuters.
Akweti said 15 people died of suffocation and 24 were injured.
15 people are understood to have been killed during a riot at a football match in the Democratic Republic of Congo, according to Sky News.
A media manager at FIFA tweeted an image believed to be from the stadium where the match was played, of two paramedics attending to a fan on the ground.
The club's Twitter and Facebook pages also detailed the riot before the end, saying "the police are struggling to evacuate the stadium and to protect the players of the game."
Government troops in the Democratic Republic of Congo have retaken control of statetelevision, and the situation in the capital Kinshasa is under control, a government spokesman has told Reuters.
Earlier, there were reports that several people had been taken hostage by armed men at the TV station as well as heavy gunfire at the international airport.
There has been heavy gunfire at the international airport in Kinshasa, the capital of Democratic Republic of Congo, a customs official has told Reuters.
It came minutes after witnesses reported gunmen attacking the headquarters of its state radio and television.
The official told Reuters: "Shooting has started here. They are shooting everywhere. We are all hiding."
Several people have been taken hostage by armed youths at state television headquarters in the capital of Democratic Republic of Congo, according to AFP.
Before the station's television feed was shut down, two presenters were seen on screen, under threat from a young man standing behind them.
Police spokesman colonel Mwana Mputu told the news agency: "They are armed with machetes and guns. They have taken reporters hostage. An operation is under way to dislodge them,"
Witnesses have reported hearing heavy gunfire at the headquarters of Democratic Republic of Congo's state radio and television station.
Both channels were off air after the shooting was heard.
State television journalists at the site said the Congolese army had launched an attack on the building to dislodge unidentified assailants.
The International Criminal Court has acquitted the Congolese warlord Ngudjolo Chui of all charges of war crimes and crimes against humanity.
Ngudjolo had been accused by prosecutors of directing militias to kill, pillage and rape during a conflict in the northeastern Ituri province of Congo in 2003.
Presiding judge Bruno Cotte said atrocities had been committed during the conflict but prosecutors had failed to tie them to Ngudjolo.
Heads of state from Africa's Great Lakes region have called on the M23 rebel group in the Democratic Republic of Congo to end their campaign and leave the town of Goma which they captured this week.
A joint statement from the leaders after their meeting in Uganda urged the M23 to end attempts to overthrow the elected government and to "stop all war activities and withdraw from Goma".
Democratic Republic of Congo president Joseph Kabila is meeting with other regional leaders in Kampala to try and end the crisis in his country, a Uganda government spokesman has told Reuters.
The UN has warned of a growing humanitarian crisis in DRC after rebels continued their advance towards capital Kinshasa.
The head of the political arm of the M23 rebel group which took control of the eastern city of Goma this week is also in Kampala, but it was not clear whether he would hold direct talks with Kabila.