The blasts on Friday targeted security checkpoint, also wounded dozens of civilians.
In one blast, an ambulance laden with explosives was detonated as it arrived at a military checkpoint in the Buraiqa area in northwestern Aden, killing about 10 soldiers and civilians, witnesses and security sources said.
The other two bombs struck checkpoints on the road to a base used by the Saudi-led military coalition that is fighting in Yemen. Security sources said at least 12 people died, though with no immediate reports of coalition soldiers among the casualties.
Amaq, a news agency affiliated with Islamic State, said the group claimed all three attacks and that at least 22 people had died.
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