U.S. Secretary of State John Kerry has confirmed in a news conference in Belgium today that two Americans were among the 31 killed during Tuesday’s bombing attack targeting the Brussels Airport and a crowded subway station near the headquarters of the European Union. This comes as Belgian authorities have detained at least six people suspected of being involved. Overnight and on Friday morning, authorities carried out sweeping raids as a search continues for at least one suspect, whom U.S. authorities say they’ve identified, although they haven’t released a name. Both Belgium’s interior minister and justice minister offered to resign after it surfaced that authorities failed to heed a warning from Turkey that one of the suicide bombing suspects was a militant. Belgium’s prime minister declined to accept the resignations.