Migrants who left via boat from Lebanon to try to reach Cyprus accused the island’s authorities on Wednesday of leaving them stranded at sea and conducting a pushback amid rising alarm in Cyprus over increased migrant boats arriving on its shores. Three boats carrying dozens of mostly Syrians left the coast of Lebanon off the northern city of Tripoli on Monday afternoon but were quickly intercepted by Cypriot authorities in the water. Passengers said they were kept stranded in the water with dwindling food and water, and the Cypriot Coast Guard denied their requests for supplies. “They had to …