According to the official, at that time "pre-hospital emergency work was underway," the injured were being taken to the hospital by the National Emergency Medical Service (INEM), and firefighters were working to free them.
Margarida Castro Martins, to Lusa, said the causes of the accident may be related to "cables and the way the trams operate, as they operate in a balanced manner."
A source from the National Institute of Emergency Medicine (INEM) also told Lusa that there are "at least 20 victims," emphasizing that these are very preliminary figures, as the accident alert was issued at 6:04 PM.

The Glória elevator, operated by Carris, connects Restauradores to Jardim de São Pedro de Alcântara in Bairro Alto, a route of approximately 265 meters, and is highly popular with tourists.
The derailment of the Glória elevator in Lisbon left 15 people dead, according to the National Institute of Emergency Medicine (INEM).
Speaking to reporters at the scene, Tiago Augusto, head of the Event Planning, State Protocol and Crisis Management Unit (UPPEC) at the National Institute of Emergency Medicine (INEM), said the accident also left 18 people injured, five of whom were seriously injured and 13 slightly injured, including a child.