MADRID/PARIS (Reuters) - Three Chechen citizens arrested on Friday on suspicion of being Islamist militants have been released without charge, the Paris prosecutor's office told Reuters.

Agents from France's secret service had arrested the trio on Tuesday as part of a joint French-Spanish operation.

One suspect, Ali Dokaev, was arrested in Noyon, around 100 km from Paris, while the other two, Elsy Issakov and Mourad Idrissov, were detained in the French capital.

(Reporting by Emma Pinedo in Madrid and Gerard Bon in Paris; Writing by Clare Kane, Paul Day; Editing by Jason Webb)