A total of 25 commercial vessels crossed the newly reopened strait on Thursday, the highest number since mid-April, according to data from tracking firm AXSMarine -- more than three times the average of just over seven a day since early March.In a sign of traffic picking up in the region, empty trucks queued for up to three kilometres (two miles) outside the UAE port of Korfakkan just south of the strait, as at least four container ships unloaded there, an eyewitness told AFP.Other ships could be seen on the hazy horizon, apparently waiting their turn to dock and unload, the eyewitness said, requesting anonymity.The spike came after Iran and the United States agreed this week to re-open the crucial route under an agreement to end the war, but before the postponement of talks between the sides in Switzerland that had been planned for Friday under that deal.The number of crossings on Thursday may be higher, as some ships turned off or manipulated their AIS transponder signals to avoid detection, AXSMarine said in a news release.Iranian forces effectively closed off the strait after US and Israeli strikes sparked the war on February 28. Maritime authorities reported dozens of attacks on ships in the area.Sea mine warningGlobal shipping groups warned this week that plans to resume traffic through the strait were still not clear and it was not thought safe to start exiting the Gulf.The Pakistani navy published an alert Friday warning that a mine had been sighted in the strait off Oman.