New York City Comptroller and mayoral candidate Brad Lander was released from federal custody Tuesday afternoon, hours after he was arrested by officers at immigration court in Manhattan after he tried to escort a migrant whom officers were attempting to arrest.

Lander was released four hours after his arrest. He told the media that he was at the courthouse to "accompany" a defendant out of immigration court.

The company is facing legal hurdles and other obstacles before its cars can cruise the city’s streets without drivers.

Waymo is bringing autonomous cars back to New York City for tests, with the hopes of eventually offering a paid ride-hailing service.

Alphabet's self-driving unit Waymo said on Wednesday its vehicles will be back in New York City next month for autonomous testing, as it continues to scale operations in the U.S.