An explosion in Kandahar province in southern Afghanistan has killed at least 39 people, Afghan officials say.
Reports said the blast ripped through a wedding party on Wednesday evening, leaving another 70 more wounded.
It is not clear what the cause is and no-one has said they planted a device.
Last week, Afghanistan held a national peace council and endorsed a plan to seek peace with the Taliban.
But violence has continued unabated.
On Monday, Nato's International Security Assistance Force (Isaf) lost 10 soldiers on its deadliest day in months.
Violent week
Mohammad Anaas, a senior official with the Kandahar city administration, told Agence France-Presse news agency the explosion took place at a wedding in Arghandab district.
He said the incident took place at about 2100 local time (1630GMT) and put the number of wounded at 73.
"We don't know how many bodies remain at the site and we don't know if it was a suicide attack or a bomb or something else," he told AFP.
The explosion was reported to have taken place in an area reserved for men.
In earlier violence on Wednesday, four American Nato soldiers were killed when their helicopter was shot down in neighbouring Helmand province.
The Taliban claimed its fighters had shot down the aircraft with a rocket-propelled grenade in Sangin district.
More than 20 Nato soldiers have died this week.
Last week, Afghan tribal leaders endorsed President Hamid Karzai's plan to seek peace with the Taliban.
The "peace jirga" backed an amnesty and job incentives to induce militants to give up arms.
The Taliban have been waging a battle to overthrow the US-backed government and expel the 130,000 foreign troops there.
Kandahar is set to be the next focus of Nato's military drive against the Taliban.
Reports said the blast ripped through a wedding party on Wednesday evening, leaving another 70 more wounded.
It is not clear what the cause is and no-one has said they planted a device.
Last week, Afghanistan held a national peace council and endorsed a plan to seek peace with the Taliban.
But violence has continued unabated.
On Monday, Nato's International Security Assistance Force (Isaf) lost 10 soldiers on its deadliest day in months.
Violent week
Mohammad Anaas, a senior official with the Kandahar city administration, told Agence France-Presse news agency the explosion took place at a wedding in Arghandab district.
He said the incident took place at about 2100 local time (1630GMT) and put the number of wounded at 73.
"We don't know how many bodies remain at the site and we don't know if it was a suicide attack or a bomb or something else," he told AFP.
The explosion was reported to have taken place in an area reserved for men.
In earlier violence on Wednesday, four American Nato soldiers were killed when their helicopter was shot down in neighbouring Helmand province.
The Taliban claimed its fighters had shot down the aircraft with a rocket-propelled grenade in Sangin district.
More than 20 Nato soldiers have died this week.
Last week, Afghan tribal leaders endorsed President Hamid Karzai's plan to seek peace with the Taliban.
The "peace jirga" backed an amnesty and job incentives to induce militants to give up arms.
The Taliban have been waging a battle to overthrow the US-backed government and expel the 130,000 foreign troops there.
Kandahar is set to be the next focus of Nato's military drive against the Taliban.

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