Rotblat thanks BR for his letter of 19 April, and its enclosed correspondence with Mahmoud Mall, which he returns (not present).

Regarding the documents, consisting of a letter from Mall to an ambassador, a reply from the attaché from the Afghanistan UN Mission, summary of proceedings of a conference on microwaves in 1960 and a poem by Mall, Rotblat writes, "... I could not find anything in these documents which would give the basis for Mr. Mall's claims about neurological warfare. Quite frankly I think that he is a crank."