London says it is 'concerned' after its warship was forced to issue verbal warnings and position itself to prevent action; effort comes after Iranian ship detained in Gibraltar

CNN says 5 Revolutionary Guards gunships try to force the tanker off course and into Iranian waters but fail; effort comes after Iranian ship detained in Gibraltar

Panamanian-flagged carrier is believed to be in violation of EU sanctions against war-ravaged Assad regime; US welcomes 'excellent news' of ships seizing

Panamanian-flagged carrier is believed to be in violation of EU sanctions against war-ravaged Assad regime

Panamanian-flagged carrier is believed to be in violation of EU sanctions against war-ravaged Assad regime