<p>French police in Marseille were holding 18 people in custody on Sunday after hundreds of fans stormed the training ground of soccer club Olympique de Marseille a day earlier, the local prosecutor said.</p>.<p>The hardcore Ultras were demonstrating against the club's leadership and a poor run of results. The supporters forced their way into the Commanderie training ground, hurling flares and firecrackers.</p>.<p>The club's Saturday evening match against Stade Rennais was postponed.</p>.<p>Marseille condemned a "frenzy of violence" and said damage amounting to several hundred thousand euros had been caused.</p>.<p>All 18 being held by police in relation to the violence were adults, prosecutor Dominique Laurent said in a statement.</p>.<p>Marseille are seventh in the Ligue 1 standings, 14 points adrift of leaders Olympique Lyonnais and failed to progress from the group stage of this season's Champions League.</p>
<p>French police in Marseille were holding 18 people in custody on Sunday after hundreds of fans stormed the training ground of soccer club Olympique de Marseille a day earlier, the local prosecutor said.</p>.<p>The hardcore Ultras were demonstrating against the club's leadership and a poor run of results. The supporters forced their way into the Commanderie training ground, hurling flares and firecrackers.</p>.<p>The club's Saturday evening match against Stade Rennais was postponed.</p>.<p>Marseille condemned a "frenzy of violence" and said damage amounting to several hundred thousand euros had been caused.</p>.<p>All 18 being held by police in relation to the violence were adults, prosecutor Dominique Laurent said in a statement.</p>.<p>Marseille are seventh in the Ligue 1 standings, 14 points adrift of leaders Olympique Lyonnais and failed to progress from the group stage of this season's Champions League.</p>