Police in Nigeria say the bomber who killed nearly 50 students in the northeastern state of Yobe was disguised in a school uniform.

On Monday, the Nigeria Police Force spokesman, Emmanuel Ojukwu, said the bomber passed unnoticed at the school in the city of Potiskum, situated about 575 kilometers (350 miles) northeast of the capital, Abuja, to detonate the explosives as students gathered for morning assembly.

Some 2,000 students had gathered for the assembly at the Government Technical Science College when the explosion ripped through the school hall, according to survivors.

A morgue attendant said 48 bodies were brought to the hospital and all appeared to be between the ages of 11 and 20. Health workers added that 79 wounded students were also admitted, with some suffering from serious injuries that may require amputations.

“We were waiting for the principal to address us, at around 7:30 a.m. (0630 GMT), when we heard a deafening sound and I was blown off my feet, people started screaming and running, I saw blood all over my body,” said Musa Ibrahim Yahaya, a 17-year-old survivor.

There has been no claim of responsibility for the bomb attack, but the bombing bears the hallmarks of similar assaults by the Boko Haram Takfiri group.

Yobe, along with some other regions in Nigeria, has been the scene of numerous terrorist attacks by Takfiri militants, including Boko Haram, in the past months.

Last week, another bomb attack in Potiskum claimed 30 lives.

Boko Haram has claimed responsibility for a number of deadly shooting attacks and bombings in various parts of Nigeria since the beginning of its operations in 2009, which have left more than 10,000 people dead so far.