The chief of Israel's Mossad intelligence service vowed Wednesday that the agency would hunt down every Hamas member involved in the Oct. 7 attack on Israel, no matter where they are. He made the pledge a day after the deputy head of the Palestinian militant group was killed in a suspected Israeli strike in Beirut. Israel has refused to comment on reports it carried out the killing, but the comments by David Barnea appeared to be the strongest indication yet it was behind the blast.