More than 1000 gang suspects have been arrested in El Salvador after a wave of killings over the weekend, the government says.
President Nayib Bukele ordered food for gang members held in Salvadoran prisons be reduced to two meals per day, seized inmates' mattresses and posted a video of prisoners being frog-marched through corridors and down stairs.
The government declared a state of emergency and locked down prisons after 87 murders were committed between Friday and Sunday.
Authorities have blamed the killings on gang members, and on Monday authorities said soldiers and police had raided gang strongholds around the capital San Salvador.
Bukele wrote that those detained would not be released.
His order that food for gang inmates be cut was aimed at stretching current food supplies to feed the new detainees as well.
"Don't think they are going to be set free," Bukele wrote Twitter.
"We are going to ration the same food we are giving now (to inmates).
"And if the international community is worried about their little angels, they should come and bring them food, because I am not going to take budget money away from the schools to feed these terrorists."
Bukele also posted a video showing guards with clubs roughly forcing inmates to walk, run and even descend stairs with their arms held behind their necks or backs.
At one point, a handcuffed inmate tumbles down a flight of stairs as a guard forces him to descend. The prisoner groans and is forced to his feet to continue running.
The inmates were stripped to their underwear, and their mattresses were taken away.
El Salvador's congress granted Bukele's request to declare a state of emergency early on Sunday amid the wave of gang-related killings over the weekend.
By comparison, there were 79 homicides in the entire month of February.
The state of emergency suspends constitutional guarantees of freedom of assembly and loosens arrest rules for as much as 30 days, but could be extended.
The decree allows suspects to be detained without a lawyer for up to 15 days, and allows police to search cell phones and messages.
The homicides appeared linked to the country's notorious street gangs, who effectively control many neighbourhoods in the capital.
The National Police reported they have captured five leaders of the Mara Salvatrucha, or MS-13, who they claimed ordered the weekend killings.
In December, a US Treasury Department report raised tensions between the two nations by claiming Bukele's government secretly negotiated a truce with leaders of the gangs
The US alleges Bukele's government bought the gangs' support with financial benefits and privileges for their imprisoned leaders including prostitutes and mobile phones.
Bukele vehemently denies the accusations.