Texas car attack — latest: George Alvarez had multiple drugs in his system at time of Brownsville crash

Cesar Romero, 34, a Venezuelan national who witnessed his friends being run over by the vehicle told CNN “some of the men killed had just arrived the night before”.

Mr Romero corroborated accounts by other witnesses that the driver, who police have identified as George Alvarez, tried to run away and yelled obscenities before being held by other bystanders until police arrived.

Authorities say they are actively considering three distinct possibilities about Sunday's crash, according to CNN.

The first possibility is that the driver of the SUV was intoxicated (police have taken a blood sample). The second is that the car may have "malfunctioned". The third is that it was a deliberate attack.

"All of these are possibilities", Brownsville Police spokeperson Martin Sandoval told the cable news channel.

The crash has prompted an outpouring of support from Brownsville residents, who are 95 per cent Hispanic or Latino according to the latest US census.

According to Texas broadcaster KIII, locals have held a vigil for the crash victims and set up a makeshift memorial with flowers and crosses.

"We're all Mexicans, Hispanics, who feel everything that is happening," said one resident, Maria Esparza. "Me and my family came from immigrants, and we came for a better life."

A witness to the crash has given a defiant message to anyone who looks down on undocumented migrants.

The 29-year-old Venezuelan man, who asked for his name to not be published, told local broadcaster KIII that he was outside the shelter when the crash occurred and that his only motive in coming to America was to give his wife and son a better life.

"There isn't any protection for us," said the man. "The people that come walking all the way over here are at the mercy of God....

"If you treat me bad because you think you're better than me, for whatever you reason – you have a house, a job, a car, whatever it is – you find a Venezuelan here walking. You should show some more empathy for us, and that goes for the whole world."

My colleague Graig Graziosi has rounded up all the information we currently have about the alleged driver of the SUV, George Alvarez.

Police say Mr Alvarez, 34, was well known to them thanks to a long list of previous criminal charges including assault, aggravated assault, and resisting arrest.

Seven victims are still hospitalised with their injuries in the aftermath of the Brownsville horror crash.

Eight people were killed when driver George Alvarez drove into a group of migrants who were waiting for a bus outside the migrant shelter.

The victims have not been publicly identitied.

A candlelight vigil will be held on Tuesday in honour of the victims killed when a car rammed into a group of migrants outside a shelter in Brownsville, Texas.

The vigil will be held at 7pm MST outside the Sacred Heart Church on Tuesday.

“Following the tragic incident that occurred last Sunday, May 7 in Brownsville, Texas, which resulted in the deaths of 7 innocent lives, the Border Network for Human Rights will hold a vigil in solidarity with migrants across our state and nation,” said the Border Network for Human Rights in a Facebook post.

During a press conference on Monday, police noted that George Alvarez has a lengthy criminal history.

His past charges include numerous assault charges, an aggravated assault charge, and additional charges for burglary, theft, DUI, and resisting arrest.

He is currently being held on a $3.6m bond, according to CNN.