Swedish Foreign Minister Carl Bildt Monday said it was crucial to "quickly establish" what has happened with the flotilla bound for the Gaza Strip carrying pro-Palestinian activists and tons of humanitarian aid that was reportedly stormed by Israeli commandos, DPA reported.
Bildt expressed concern over media reports - mainly from Turkish outlets - that there had firing and that people had been killed and injured on a Turkish-flagged vessel.
"We are trying to clarify what has happened," Bildt, currently visiting Italy, told Swedish radio news.
"We have summoned the Israeli ambassador to get information," Bildt said, adding he had also been in touch with the European Union's foreign policy chief Catherine Ashton to ensure that the EU gives a "clear response during the day when we get a clearer picture of what has happened."
Among issues needing clarification was if the events took place on international waters or in Israel's territorial waters, he said.
"This is a very serious situation, it will have serious consequences. That is why it is very important to clarify facts," Bildt said.