* Brnieq says rebel aircraft sank Gaddafi ships
* Not clear where they took off from
(Updates with background)
RABAT, March 15 (Reuters) - An opposition Libyan online newspaper on Tuesday said a rebel MiG 23 warplane and a helicopter sank two pro-Gaddafi warships off the eastern coast near the front line of land battles at Adjabiyah.
The Brnieq website quoted an unnamed air force officer at the Benina airbase in rebel-held Benghazi as saying the aircraft also bombed an unspecified number of tanks near Brega and Ajdebiya.
Those two towns fell to troops of Muammar Gaddafi on Tuesday as his army advanced eastwards towards Benghazi.
It was not clear where the two aircraft took off from. The airbase at Benghazi switched to rebel control when the opposition took charge of the city and several air force officers have been among military men who joined the opposition. (Reporting by Souhail Karam, writing by Tom Heneghan; Editing by Matthew Jones)