"New York City stands with the Salgado family in demanding a full, independent investigation and real accountability. To the Salgado family and any immigrant family in this city living in fear: we grieve with you and we will continue to stand beside you in the pursuit of justice," the mayor wrote.
He finished the tweet with a simple message: "Abolish ICE."
In the past, Mamdani has said that city agencies would follow sanctuary city guidelines by not assisting ICE in most cases.
"Our city does not simply oppose the actions of ICE, but that we are not going to be complicit with those actions either," Mamdani said in June.
"And that means making sure that every single city agency is in compliance with our sanctuary city policies... It means that we do not allow ICE agents into our schools, our hospitals, our city property unless they can provide a judicial warrant signed by a judge."
During a TV appearance in June, Mamdani again called for the abolishment of ICE.
"I have put forward a vision alongside so many others to say that ICE should be abolished, that there is no way to reform this kind of cruelty that we're seeing endemic in the way that immigration is being enforced across the country," he said on MS NOW.