At least 14 people died when a boat carrying some 70 undocumented migrants capsized in the Mediterranean after setting off from Morocco bound for Spain, authorities said Thursday.

Seventeen people were pulled from the water alive off the coast of Alhucemas, Morocco, Spain's Maritime Rescue service said, adding that some of the survivors were in need of "urgent medical assistance."

Maritime Rescue took the survivors to Alhucemas.

One of the survivors said 71 people were aboard the flimsy craft when it left Morocco, Spanish officials told Efe.

Authorities from both countries began searching for the boat on Wednesday after a tip from someone who feared for the safety of a family member aboard the craft.

The boat was located by a Maritime Rescue surveillance plane, which lowered a raft to pick up some of those in the water and summoned vessels from both Spain and Morocco to aid in rescue and recovery efforts.

The Maritime Rescue remained in the area to search for additional survivors or victims. EFE