The reason given: One of the boats was not seaworthy despite it having sailed before.
Listen to an interview with passengers Cynthia McKinney and Caoimhe Butterly.
Updated @1153 on 25 June 2009:
THEY DENIED US SO THEY WOULDN’T HAVE TO RAM US!
A critical observer of Iran’s green revolution has suddenly disappeared from Twitter. “Why has @adoostdar Twitter account been suspended? Anyone know?”