The Solomon R. Guggenheim Foundation and the International Council of Museums, which organised petitions, said they had collected more than 90,000 signatures calling for the release of Ai. On 13 April 2011, a group of European intellectuals led by Václav Havel had issued an open letter to Wen Jiabao, condemning the arrest and demanding the immediate release of Ai. The signatories include Ivan Klíma, Jiří Gruša, Jáchym Topol, Elfriede Jelinek, Adam Michnik, Adam Zagajewski, Helmuth Frauendorfer; Bei Ling (Chinese:贝岭), a Chinese poet in exile drafted and also signed the open letter.