by Chris Bodenner
1225 GMT: Al Jazeera reports a sixth member of its staff has been arrested. Equipment has been seized, as the six journalists and crew are held at an army checkpoint outside the Hilton Hotel next to Al Jazeera English's bureau.
One of the detained reporters, Dan Nolan, is still tweeting. Update:
1346 GMT: Al Jazeera reports now that six of its journalists that were arrested have now been released. Their equipment, however, has been kept.