Speaking to reporters in London, President Connolly said she is “very proud” of her sister.
“It seems like this happened in international waters and it’s a cause of worry really,” she added, noting she has no further information other than what has been reported.
The Israeli army has intercepted the fleet and detained around 100 activists as the mission sought to break the blockade on the Palestinian enclave.
The flotilla, consisting of more than 50 boats, set sail Thursday from the Turkish district of Marmaris.
Organisers have confirmed the mission included 426 participants from 40 countries, including Türkiye, the UK, and the US.
This follows a similar attack on April 29 off the coast of Crete.
