* Government to rule only until elections this year * Larayedh says polls to be held by November at latest * Same three coalition parties in new government * Independents handed control of important ministries By Tarek Amara TUNIS, March 8 (Reuters) - Tunisian Prime Minister Ali Larayedh unveiled a new coalition government led by the moderate Islamist Ennahda party on Friday, saying it would serve only until an election later in the year.

Premier-designate Ali Larayedh was set to unveil Tunisia's new coalition government on Friday after a deal was reached in last-minute talks aimed at ending a major political crisis. "After marathon negotiations, we have reached an agreement on the government... we are going to give it the final touch tomorrow morning" before presenting the plan to the president, Larayedh said late on Thursday.

Premier-designate Ali Larayedh will unveil on Thursday night a new coalition government after tortuous negotiations aimed at ending a serious political crisis, the office of President Moncef Marzouki said. "He will present the list of the new government's members and then hold a news conference," Marzouki aide Chaker Bouajila said, without providing details on the new cabinet line-up. Earlier, Larayedh was reportedly going in to tense, last-minute negotiations on forming a new coalition government to defuse Tunisia's political crisis.

* Killing plunged Tunisia into crisis * Radio says three arrested, but report not confirmed (Adds details, background) TUNIS, Feb 25 (Reuters) - A hardline Islamist has been arrested in connection with the killing of a Tunisian opposition politician whose death earlier this month touched off protests across the country, a security source said on Monday.