They urged Tim Davie, the BBC director-general, to take action against theMatch of the Dayhost.
He later added: We take far fewer refugees than other major European countries.
A second insider added: Its a massive problem for us.

Gary LinekerGetty
Tim needs to act decisively now.
Suspend til end of the [football] season?
Two sources said the matter was complicated by the presence of Richard Sharp, the BBCs chairman.

They havent really got a leg to stand on with the Sharp stuff, said a source.
I want to thank each and every one of you.
It means a lot.
Ill continue to try and speak up for those poor souls that have no voice.
Cheers all, he said.
The BBC said: The BBC has social media guidance, which is published.
Individuals who work for us are aware of their responsibilities relating to social media.
We have appropriate internal processes in place if required.
We would expect Gary to be spoken to and reminded of his responsibilities.
Deadline has approached Linekers representative for comment.