April 23 (Reuters) - TransAlta Corp TA.TO :
* TRANSALTA COMMENTS ON MANGROVES' LATEST NEWS RELEASE
* "MANGROVE'S LATEST CLAIM IS WITHOUT MERIT AND IS SIMPLY LATEST COMPLAINT IN A STRING OF FRIVOLOUS TACTICS," SAID CHAIR OF CO'S BOARD
* "WE WILL DEFEND TRANSALTA AND INTERESTS OF OUR SHAREHOLDERS VIGOROUSLY," SAID AMBASSADOR GORDON GIFFIN, CHAIR OF BOARD OF TRANSALTA