The Mexican government announced Monday that another migrant — the 40th — died after the March 28 fire at a detention center in Ciudad Juarez, on the border with the United States.

The victim, whose nationality was not specified, succumbed to complications from the burns he suffered.

He had been airlifted from Juarez to a burn care center in the capital, the Secretariat of Public Security (Ministry) explained.

The fire injured 27 people, of whom 23 remain hospitalized, according to the Mexican government. Five burn victims were treated in the capital.

Authorities have made five arrests, including that of an immigrant, as part of their ongoing “serial murder” investigation.

The arrested immigrant allegedly started the fire by setting fire to a mattress in protest of his impending deportation.

The remaining four arrested are public officials and private guards who allegedly stood idly by, did nothing to save migrant detainees who were locked inside the cell where the fire broke out.

Closed-circuit surveillance video released by Mexican media shows three workers at the detention center leaving the locked migrants helpless as thick smoke billows from the cell.

Mexican President Andres Manuel Lopez Obrador, who visited Juarez on Friday, promised there would be no “impunity”. Migrants tried to hang themselves from the car carrying him, demanding justice.