(CNN) At least 42 people, mostly soldiers and one child, were killed when attackers launched four suicide car bombings at security targets in a major Yemeni city, two senior government officials told CNN.

The attacks occurred in Mukalla, a southeastern port city in Hadramaut province.

At least 30 people were injured -- all security officers except for five civilians, according to the two officials, both of whom are in the provincial governor's office.

One of the attacks targeted a military compound near a government intelligence building. The others targeted military checkpoints. A child walking near one of the checkpoints was killed.

The attackers were from ISIS, group's media voice says

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