Two bombs exploded near buses full of Christian students in Mosul, Iraq on Sunday.
The blasts killed one bystander and injured about 100 others. The attacks came just days after an al Qaeda-linked group issued new threats against Iraqi Christians.
"Today was terrible and I will not forget it for the rest of my life," said Wisam Jarji, a student who was wounded in the blast. "Following the explosion, the situation in the bus was chaotic and I could see blood stains and hear screams all over the place."
According to the group, Voice of the Martyrs, Ansar al-Islam sent an email to Shlemon Warduni, the Chaldean bishop of Baghdad, issuing a warning to Christians to leave the country.
"There's no more room for you, you infidels among the Iraqi Muslims," the letter said. "Our swords shall be placed upon your necks and the necks of your followers."
Christians said violence and threats against them have increased since the recent election. Many are staying away from their churches and Christian businesses.