(CNN) - At least one person was killed and 80 others wounded in a double bombing near the northern city of Mosul on Sunday, according to police.
A parked car bomb and a roadside bomb detonated in quick succession in Kokjali, east of Mosul, striking buses transporting mostly Christian university students.
Minorities in Iraq, especially in the north of the country, including Christians, have been frequently targeted by militant groups.
Although the overall levels of violence across the country have dropped drastically compared to the height of the sectarian war in 2006 and 2007, official figures showed an increase in civilian casualties last month.
At least 274 civilians were killed in April compared to 216 in March and 211 in February, according to Interior Ministry figures.