The car, which was carrying four officers who worked for Aden Police Chief General Shalal Ali, was believed to have been the target of the attack.
There have been previous assassination attacks targeting the general.
Yemen has been in conflict when Saudi Arabia with airstrikes support former fled president Abd Rabbu Mansour Hadi forces fighting with Shiite Houthi Ansarallah revolutionaries.
Militants from Al-Qaida and the extremist ISIS (Islamic State , ISIS , ISIL , IS , Daesh) group have taken advantage of the chaos to expand their footprint, but government forces claimed to have recently cleared Aden of militants.
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