At least 28 are people have been killed in a series of explosions that targeted bars in the northern Nigerian city of Kano, a hospital source tells the BBC.
Witnesses stated the blasts shook a Christian neighbourhood that has previously been attacked by militants from the Islamist group Boko Haram.
The army stated.12 people had been killed when explosions placed in packages were dropped in the area on Monday evening.
Correspondents say the Muslim majority in the city are now anxious about possible reprisals, as people come out onto the streets after breaking their daytime fast during the Muslim holy month of Ramadan.
"We have had some explosions in Sabon Gari this evening," Kano State Police Commissioner Musa Daura stated.
"The explosions occured at open-air beer parlours, where people were playing snooker."
Eyewitnesses say multiple blasts struck the predomitly Christian district at around 21:30 local time (20:30 GMT), in an area where people had gathered to enjoy the area's nightlife.
"After the first bomb, I threw myself into the canal (drain) to hide. There were at least three blasts," resident Kolade Ade told Associated Press news agency.
Fruit vendor Chinyere Madu told the AFP news agency she heard four explosions, which "shook the whole area".
She stated she "saw one person carrying someone on his shoulders with bleeding legs".
The BBC's Yusuf Ibrahim Yakasai in Kano says that the military have cordoned off the blast site, preventing people from entering the area.
A hospital worker told BBC reporter he had counted 28 dead bodies; a further 15 were wounded.
However, the military stated the explosions left 12 people dead and a "couple of others" injured.
The blasts could have been avoided if the public had been vigilant, and had spotted packages containing explosive devises being "dropped" in the area, the military stated in a statement.