Running of the bulls bullring, which acts as a funnel as it is much narrower than the previous street. In such cases injuries come both from asphyxia and contusions to those in the pile and from goring if the bulls crush into the pile. This kind of blocking of the entrance has occurred at least ten times in the history of the run, the last occurring in 2013 and the first dating back to 1878. A runner died of suffocation in one such pile up in 1977. Overall, since record-keeping began in 1910, 15 people have been killed in the bull running of Pamplona,
Running of the bulls herd is . The length of the run is . It goes through four streets of the old part of the city (Santo Domingo, Ayuntamiento, Mercaderes and Estafeta) via the Town Hall Square and the short section "Telefónica" (named for the location of the old telephone office at end of Calle Estafeta) just before entering into the bullring through its callejón (tunnel). The fastest part of the route is up Santo Domingo and across the Town Hall Square, but the bulls often became separated at the entrance to Estafeta Street as they slowed down. One or more would slip going