Lt. Ikedichi Iweha, a spokesman for the Military Joint Task Force, said earlier Tuesday that 12 people died at the scene and "a couple" of people were wounded in Monday night's attack, which he blamed on suspected members of the Islamic extremist Boko Haram network.
But the spokesman for Aminu Kano Teaching Hospital said their mortuary had 24 bodies brought from the scene and from the city's Murtala Muhammad Specialists Hospital.
The teaching hospital also was treating nine people wounded in the blasts, said spokesman Aminu Inuwa. It was unclear how many others might be in treatment at other hospitals.
More than 100 people gathered outside the hospital morgue, weeping and screaming in anguish Tuesday afternoon. Military officials would not allow them into the morgue, so many said they have no idea if missing loved ones are dead or alive.
Nigeria is fighting an uprising by Islamic extremists based mainly in the northeast, where the government has declared a state of emergency. Kano city and state are in the northwest and not part of that emergency. Boko Haram, which means "Western education is forbidden," wants to impose Islamic Shariah law in all of Nigeria, Africa's most populous nation of more than 160 million divided almost equally between Christians who live mainly in the south and Muslims who dominate the north.
Nigeria's army announced Tuesday it has arrested 42 suspected Boko Haram members in the southwestern states of Ogun and Lagos, which includes the commercial capital of the same name.
Maj. Gen. Obi Umahi told reporters that some of those detained already have admitted to belonging to the terrorist network. He said some said they had fled from strongholds in the northeast of the country that are under a state of emergency and military operations.
Boko Haram has never attacked targets in the southwest of the country.
Umahi said some suspects were arrested in Lagos on upscale Victoria Island's Bar Beach and in the Lekki neighborhood. The arrests were made between July 12 and 23.
That raises fears that the military operations have forced militants into other states where they could attack.
Monday night's attack at just after 9 p.m. (21:00 GMT) rocked an area popular for its outdoor bars, blaring music, snooker tables and table tennis.
Witness Kolade Ade said at least one blast appeared to come from a Mercedes-Benz parked beside the bar.
"After the first bomb, I threw myself into the canal (drain) to hide. There were at least three blasts," he said.
But Lt. Iweha said in a statement that the explosions were not the work of a suicide bomber but of parcels of explosives planted in the area.
"This latest incidence could have been avoided if citizens maintain vigilance to observe when packages are dropped, as it was in this case," he said.
The explosions came as hundreds of people thronged the area in the Sabon Gari neighborhood, and raised fears among the city's mainly Muslim population.
In March, a suicide bomber drove a car loaded with explosives into a bustling bus station in the same Christian neighborhood of Sabon Gari, killing 25 people.
Exactly a year ago, suspected Islamic militants attempted to attack a mosque in Kano city. They were engaged by police in running gun battles in which the militants killed five civilians and police killed four of the attackers.
In December, three days before Christmas, Kano was rocked by twin suicide car bombings that targeted two major mobile telephone companies. One worker was injured in one attack. Security officials botched the second attack by shooting the bomber, which caused an explosion at the company's gate.
In January, worshippers foiled an attack on Kano Central Mosque, killing two suspected bombers.
President Goodluck Jonathan declared a state of emergency on May 14 in six northeastern states covering one-sixth of the country, admitting that Islamic fighters had taken control of some towns and villages.
Militants have targeted Muslim political and religious leaders who preach against their extreme form of Islam. Recently, the extremists have targeted schools, killing scores of students and some teachers.
The Boko Haram network is blamed for the killings of more than 1,600 people since 2010, when suicide bombers drove a car filled with explosives into the lobby of the United Nations offices in Abuja, Nigeria's capital.
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