Two people were injured and two others remain missing after an ice cave in south-east Iceland collapsed on Sunday. A group of 25 tourists was visiting the Breiðamerkurjökull glacier as part of a guided tour when the cave collapsed. Dozens of rescue workers were deployed, including specialized cave rescuers and two helicopters, broadcaster RÚV reported. A spokeswoman for the authorities said that the conditions at the scene of the accident were extremely difficult. Breiðamerkurjökull, located in the south-east of the country, is a glacial tongue that extends from southern Vatnajökull into the g…