MSN reports, British Royal Marines seized an Iranian owned oil tanker near Gibraltar. They landed on the ship by helicopter during the night and customs authorities are detaining the mostly Indian crew as witnesses.
Meanwhile Iranian official are saying they will be obligated to retaliate against a British tanker.
Note this action was taken because the cargo was believed to have been destined for Syria, in violation of a EU imposed embargo.
Chuck Hill's CG Blog 
Good interview on the topic. https://mediaview.aljazeera.com/video/boiSbERGQc?fbclid=IwAR2Xv69M7Mgs-GabHPYkDaNOKUmnmHF4bKdWv4I985Ode_aE6Lu7r8PatT8
Mediterranean tanker war?
Royal Navy had to scare off Iranians apparently trying to seize a British oil tanker. https://www.thesun.co.uk/news/9482610/iran-standoff-royal-navy-oil-tanker/?fbclid=IwAR3AMhb-Ptofk5NpbHSL3JrJcEW8zj9cFXb29lJzSoIVc0nvWo2rO1WA_kg
Similar report from Stars and Stripes. https://www.stripes.com/news/middle-east/british-warship-fends-off-iran-boats-attempting-to-seize-oil-tanker-1.589833?fbclid=IwAR00apT64JEiLCpV8HanTIGKNyxXWG0blqOdFdAk1tIkfPO6UUT03NAnGBM
For whatever reason, Iran has seized a Panamanian flag tanker. https://amp.theguardian.com/world/2019/jul/18/iran-says-it-has-seized-foreign-oil-tanker-in-gulf?fbclid=IwAR3ch4Wl5sbb1Q_q43-_8wUTN8M27EIjdL5ZigFau65IBU-NXqBrUgNe_z0
USS BOXER shoots down Iranian fixed wing drone seen as threat. https://news.usni.org/2019/07/18/uss-boxer-downs-iranian-drone-in-defensive-action?fbclid=IwAR1H9DJJKUGmojknvywcDq20qF2iylv6T8r8rBman9tIzD2YwJKM6xHPETg
Drone was apparently downed by a Marine 4×4 based electronic countermeasures system that was being transported by Boxer. https://www.military.com/daily-news/2019/07/18/heres-new-marine-corps-weapon-just-destroyed-iranian-drone.html
Iran has apparently seized two British owned tankers. https://www.bbc.com/news/uk-49053383?fbclid=IwAR2dw6Rj4FbnjI16443jej4YOc43j7fBHfDn__Cn0joLqNonkWLdnPeJKCI#
Iran is playing a game of brinksmanship as if it is already a nuclear power. The hand-ringing, conflict-avoiding Europeans and the domestic-policy emphasizing President had better decide it’s time to be proactive soon, or the potential for nuclear conflict sky-rockets (geopolitically and ideologically).