Tablighi Jamaat and the Dewsbury Markaz has been accused of promoting extremist Islamism and having links with Islamic terrorism in Britain; Mohammad Sidique Khan and Shehzad Tanweer, two of the 7 July 2005 London bombers, are reported to have attended prayers at the mosque. Both the allegation of extremism and specific claims that Sidique Khan or Tanweer visited the mosque are denied by its leaders.