At least two people died in a recent attack on Christians in Nigeria. More than 45 others were wounded.

On Sunday a car bomber attacked a Catholic church during mass, detonating his bomb after being stopped at the church's gate.

So far, no group has claimed responsibility for the blast, but many suspect the radical Islamist sect Boko Haram is behind the attack.

The group has waged war on Christians in Nigeria. This year alone nearly 700 people have been killed during Boko Haram attacks.

More than 150 people have also been arrested. Nigeria's military said the crackdown is meant to disrupt Boko Haram, but at least 36 people were also killed in the process.

Boko Haram often uses guerrilla tactics and has ties to other terror organizations like al Qaeda.

"Often in the main stream media Boko Haram is presented as a sect as if they had a theology of their own or a small extremist group that is not the case," terrorism expert Walid Phares explained. "Boko Haram is a jihadist movement that has the same ideology as all other salafist jihadist movement as al Qaeda, the Taliban, as al-Shabab."

"What they want to do is to establish an emirate, an Islamist radical state first in the northern part of Nigeria, implement a very narrow Sharia law in northern Nigeria and then push to the south and declare an emirate across Nigeria," he added.

Officials say it's still unclear if the crackdown made any progress in stopping Boko Haram.