Former Congresswoman Cynthia McKinney was not among the 21 activists released by Israel Tuesday. McKinney and the others were taken into custody Tuesday as the ship they were on attempted to defy a blockade of Gaza to deliver supplies. The Greek-registered Arion was seized in the Mediterranean, 23 miles off the Gaza coast. On Wednesday Israeli authorities released an American filmmaker and a Danish human rights activist, according to freegaza.org, the web site of the Free Gaza Movement, which organized the voyage opposing the blockade. Several other passengers, including McKinney, of Georgia, and 1977 Nobel Peace Prize recipient Mairead Maguire, who co-founded a group that worked for peace in Northern Ireland. It isn’t the first time that McKinney has had an encounter with Israeli forces. In December, a small boat on which she was traveling collided with an Israeli naval vessel. “We are definitely going to go [back] even if we have to paddle across,” Greta Berlin, a Free Gaza Movement spokeswoman, told reporters in Cyprus. Spokesman Darby Holladay said the U.S. embassy has been in touch with Israeli authorities. “We understand that the passengers are safe and accounted for,” he said. Israel’s blockade of Gaza has been in effect since 2007.