RESQSHIP said the bodies of the sisters, aged 9, 11 and 17, were found inside the boat, which was “dangerously overcrowded” and had been buffeted by waves of up to 1.5 metres (4.9 feet) before a rescue vessel arrived at the scene.
Among the 65 people rescued by the charity’s Nadir vessel were three pregnant women, children, and a seven-month-old baby. One person fell overboard earlier in the crossing and remains missing, RESQSHIP added in a statement.
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It did not give details about the nationality of the three dead girls.
The Nadir intercepted the rubber boat, which had departed from Zuwara in Libya overnight on Friday, after being alerted by the hotline rescue operator Alarm Phone, the charity said.
Italy’s coastguard evacuated 14 people – medical cases and their relatives – on Saturday afternoon and took them to the southern Italian island of Lampedusa, where the Nadir arrived later in the day with the remaining survivors and the bodies of the three girls.