The shelters that house immigrants in Mexicali had been reported at full capacity, according to media reports.
Even worse, the state expects thousands more in the coming days.
Activist Sergio Tamai proposed to open temporary shelters in empty buildings and other public facilities in Tijuana and Mexicali to avoid a potential humanitarian crisis.
In the meantime the City of Mexicali opened a 142-bed shelter in the CREA sports complex that received 20 immigrants just on Wednesday.
Some other city facilities had been opened to house immigrants. Tamai said all other shelters that have altogether a capacity of a thousand beds are already full.