PARIS (Reuters) - French authorities are looking into a second, suspicious explosion which occured last month at the Dakar sports car rally, reported French radio station RMC.

       This second blast, the cause of which is undetermined for now, occurred at the Dakar rally a day after an earlier explosion went off under a vehicle which, France says, might have been a terrorist attack.

       France's DGSI secret service is looking into the case of an assistance vehicle which had exploded one day after the initial blast seriously injured a French race driver, reported RMC.

       French prosecutors said earlier this month that they had opened a terrorism investigation into the matter while Foreign Minister Jean-Yves Le Drian said "there were hypothesis that it was a terrorist attack."

       (Reporting by Tassilo Hummel; Editing by Sudip Kar-Gupta)