PARIS - French Prime Minister Edouard Philippe on Tuesday called on French citizens to be vigilant following the suicide attack at a concert in Manchester, which Philippe described as an 'abominable crime.' 'The most cowardly form of terrorism has struck once again, targeting - as in Paris more than a year ago - a concert venue,' Philippe said in a statement in a reference to a similar attack at the Bataclan concert hall in Paris in November 2015. 'I call on my fellow citizens to observe the utmost vigilance, confronted as we are with a threat which is more present than ever before,' Philippe said.