A grenade exploded during a wedding party in Sudan's capital Monday, killing at least seven people, including three children, security and medical officials said.

The officials said the explosion also injured at least two dozen adults and children, who were taken to nearby hospitals from the party in the Shegla neighborhood in Khartoum's al-Haj Youssef district.

The officials spoke on condition of anonymity because they were not authorized to brief the media.

Images shared online showed injured people with bandages and blood on their bodies being treated at a hospital.

It was not immediately clear who was behind the explosion.

While such explosions are rare in Khartoum, the city has suffered from insecurity in recent months. Police found at least three people slain in unclear circumstances in different parts of the capital over the past two weeks.