R/data_irps.R
irps_911.RdThis network records two different types of relationships between and surrounding the hijackers of four planes in the United States on September 11, 2001, culminating in those planes crashing into four locations: New York's World Trade Center (North and South buildings), as well as the Pentagon and a location in Somerset County, Pennsylvania.
The hijackers were members of al-Qaeda. Valdis Krebs collected further information on the broader network of associates of these hijackers from what major newspapers, such as the New York Times, the Wall Street Journal, the Washington Post, and the Los Angeles Times, reported in the weeks after the attacks, reflecting on the challenges of collecting this information even after the fact. He began with the 19 hijackers, and added an associate or a relationship as it was reported.
The data includes two types of ties: "trust"ed prior contacts among the hijackers, and "association" ties among the hijackers but also their broader associates. All associates are named, along with a logical vector about whether they were a hijacker or not, and if so which their (eventual) target was.
data(irps_911)#> -- # 9/11 hijackers and their associates ---------------------------------------
#> # A labelled, complex, multiplex, undirected network of 60 terrorists and 126
#> association ties and 27 trust ties
#>
#> -- Nodes
#> # A tibble: 60 x 3
#> label hijacker target
#> <chr> <lgl> <chr>
#> 1 Majed Moqed TRUE Pentagon
#> 2 Khalid Al Mihdhar TRUE Pentagon
#> 3 Hani Hanjour TRUE Pentagon
#> 4 Nawaf Alhazmi TRUE Pentagon
#> 5 Salem Alhazmi TRUE Pentagon
#> 6 Ahmed Alnami TRUE Pennsylvania
#> # i 54 more rows
#>
#> -- Ties
#> # A tibble: 153 x 3
#> from to layer
#> <int> <int> <chr>
#> 1 1 3 association
#> 2 1 3 trust
#> 3 2 3 association
#> 4 2 3 trust
#> 5 2 4 association
#> 6 2 4 trust
#> # i 147 more rows
#>Krebs, Valdis. 2002. "Mapping networks of terrorist cells". Connections 24(3): 43-52.