This video - from viewer Mark Bloomfield - shows people gathering outside, as fire crews tackle the blaze on the National Library of Wales' roof.
It is thought that nobody will be allowed back inside the library until tomorrow.
Workers were all evacuated after the fire broke out.
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Before the plane took off on February 16, teacher Juhel Miah was escorted off the flight by security.
Our Valleys Correspondent Hannah Thomas has been spending time discovering why the people who live in the Valleys love their communities.
The Cardiff-born centre, who celebrated his 24th birthday earlier this month, has signed a two-year deal with the region.