Mariah Carey Cancels Concert Belgium's Too Dangerous

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0325-mariah-carey-tmz-getty-01Mariah Carey's pulling the plug on her birthday concert in Brussels in the wake of the terrorist attacks.

Mariah was scheduled to do a show there on Easter Sunday -- which is also her 46th birthday -- but she says, "I am being advised to cancel my show for the safety of my fans, my band, crew and everyone involved with the tour." 

We're told that advice came from Mariah's security team and as of now, there's no plan to reschedule the concert. Brussels has been a hot zone since Tuesday's attacks -- police have been conducting daily raids to root out suspects.

Mariah added, "I hope to see you soon and send my prayers and eternal love, laughter and light to my Lambs."

As we reported ... The Who frontman Roger Daltry thinks artists should "keep calm and carry on." So we gotta ask ...