The increased security may have prevented even more carnage as witnesses said a security guard stopped a car bomber from entering the mall moments before the massive explosion on Wednesday.
Survivor Donald Chikason told ThisDay newspaper that a security guard argued with the driver of a car who wanted to enter Emab Plaza through the exit gate.
When the guard refused, the man bent down and moments later the car exploded, today's edition of the newspaper quoted him as saying.
Chikason, who works at a bank in the mall, was knocked out by the blast and only regained consciousness in the hospital. The explosion was heard miles (kilometres) away. It set 17 vehicles ablaze and shattered windows throughout the four-story complex.
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Body parts lay around the exit gate, other witnesses told The Associated Press. Dozens of wounded survivors were recovering in the hospitals today, most suffering burn wounds like Chikason, but at least one victim's leg was amputated, doctors said.
Nigerian intelligence received information that Boko Haram extremists were planning such an attack, said spokeswoman Marilyn Ogar of the Department of State Security.
Emab Plaza is the biggest and busiest in Abuja, the nation's capital in central Nigeria. The explosion occurred around rush hour as many residents were hurrying to view Nigeria's Super Eagles match against Argentina at the World Cup in Brazil.
The state security department did not publish the intelligence about the threat to shopping malls, apparently to avoid a panic.
Speaking to reporters at the main hospital, he sympathised with victims and their families and called the 5-year-old Islamic uprising "one of the darkest phases in the history of our nation." Still he said he was confident "we shall surely pass through this" and promised the perpetrators would be brought to book.