Al-Qaeda no doubt, when was the last time we saw a suicide bombing in Egypt?…

(CNN) — Evidence indicates that a suicide bomber caused the explosion outside a church in Egypt on Saturday that killed at least 21 people, the country’s interior ministry said.

Authorities believe the bomber was killed in the blast, the interior ministry said in a statement. Forensic testing confirmed that the explosive device used was homemade and contained nails and ball-bearings, according to the statement.

Egypt’s health ministry said 79 people were wounded in the attack in Alexandria, the country’s official Middle East News Agency (MENA) reported. Four of them were police officers posted outside the church to protect the Christians worshipping inside, the interior ministry said.

“We heard a thunderous sound of explosion. I fell on the ground. I saw a car burning. You cannot imagine what we have seen there. … It was a horrible scene,” said Nermin Nabil, who was crossing a street near the church when the blast went off.

State-run Nile TV showed firefighters battling a blaze at the scene.