The man in his 40s is being investigated for links to the PCPA, says Israel's Foreign Ministry on X. He is one of two participants from the convoy who are now being taken to Israel for questioning.
Israel classifies the PCPA as a terrorist organization. According to Israel's Defense Ministry, the group acts as Hamas' representative body outside the Gaza Strip.
The organization behind the convoy, Global Sumud Flotilla, says the man has Swedish citizenship but is a resident of another EU country.
During the operation on Thursday, the Israeli military stopped around 20 boats from the Gaza convoy near Crete in the Mediterranean Sea. Several of the activists, including some Swedes, were taken ashore in Greece.
The Swedish Foreign Ministry confirms to SvD that the man is being held in Israeli custody.
