The Trump administration has invoked a 227-year-old law, the Alien Enemies Act, to target Tren de Aragua, a gang with its roots in the prisons of Venezuela. Who are they and how wide is their reach?

Tren de Aragua was originally a prison gang that Hector Guerrero Flores turned into a "transnational criminal organisation", according the US state department, which is offering a reward of $5m for information that could lead to his arrest. Guerrero Flores, 41, was in and out of Tocorón for more than a decade.

Trump earlier in the day invoked the Alien Enemies Act of 1798 against the Tren de Aragua group, saying the U.S. was facing an "invasion" from a criminal organization.