JERUSALEM — Former Georgia Congresswoman Cynthia McKinney and most other members of a group of foreign peace activists seized at sea by the Israeli navy remain in custody after an attempt to run Israel’s blockade of the Gaza Strip.

In the latest attempt by activists to break a crippling two-year blockade of Gaza, a group called the Free Gaza Movement sent the ship loaded with humanitarian supplies and 21 activists and crew from Cyprus.

The Israeli navy intercepted the ship Tuesday after it ignored repeated messages saying it would not be allowed to enter Gaza waters and ordering it to turn back.

Among those still being held pending a hearing Sunday is McKinney, who represented Georgia’s Fourth District as a Democrat.