Famous dataset of the terrorists involved in the 9/11 bombing of the World Trade Centres in 2011. Data was extracted from news reports and ties range from <U+2018>at school with<U+2019> to <U+2018>on same plane<U+2019>. 1-mode matrix 19 x 19 person by person of trusted prior contacts and 1-mode matrix 61 x 61 of other associates. Ties are undirected and binary. Relations are a mix of prior-contacts like trained together, lived together, financial transactions, at school with, on same flight.
covert_2igraph object
Krebs, Valdis E. "Mapping networks of terrorist cells." Connections 24.3 (2002): 43-52.