An explosion near a shopping mall in Nigeria killed 21 people on Wednesday, shortly before the country's national team played Argentina in the World Cup in Brazil.
The site in the capital, Abuja, was crowded with shoppers and commuters at the time of the blast.
Police say many people were wounded.
No one has claimed responsibility for the blast.
On June 17th, an explosion killed more than 20 people at a World Cup public viewing venue in northeastern Nigeria. On Monday, an explosion at a medical school in the north killed 8.
Islamist extremist group Boko Haram is believed to be behind those incidents. Members of the group kidnapped more than 200 schoolgirls in April.
Jun. 25, 2014 - Updated 21:16 UTC