Including the arrests on Tuesday, Spain has detained 12 people with suspected links to Islamic militants so far this year.
In 2015, Spain arrested 102 people accused of connections to the Islamic State, more than twice that in the previous year as police stepped up security measures after attacks in Paris.
Authorities also arrested nine people accused of belonging to and collaborating with a criminal and terrorist organization due to connections with the Kurdistan Workers Party (PKK).
Ceuta is one of two Spanish territories on the Moroccan coast - the other is Melilla - and has been a focus of Spanish anti-militant investigations. In March 2015 Spain said it had dismantled a militant Islamist cell in the enclave that it said was ready to attack either Spain or other targets in Europe.
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