Loomer has since defended her remarks in a series of tweets.
Loomer, a former operative for the right-wing Project Veritas, began hurling polarizing accusations at the companies and calling for her followers to boycott Uber after it confirmed the suspect in the New York City terrorist attack that killed eight people Tuesday, Sayfullo Saipov, previously drove for the company.
Laura Loomer is going to have to find another way to get around.
Loomer, who describes herself on her Twitter page as "an investigative journalist" and a "proud American Jew", posted several anti-Muslim posts on Tuesday and Wednesday following the attack in New York City by a Uzbek national that killed 8.
Authorities on Thursday charged Uzbekistan-born USA immigrant Sayfullo Saipov with providing material support and resources to a designated foreign terrorist organisation - Islamic State - and violence and destruction of motor vehicles.
Loomer, who's Jewish, also tweeted: "I generally try to not support Muslim owned businesses companies here in NY".
Loomer also took a photo of two women wearing headscarves near the scene of the terrorist attack on Wednesday, tweeting, 'Muslims are out in full force at the scene of the NYC #ISIS attack today rubbing it in everyone's face.
After Loomer's outburst, both Uber and Lyft informed Business Insider they had canceled Loomer's accounts for violating the community guidelines. Uber said it is cooperating with investigators.
This isn't the first time Uber has banned users for controversial race-related comments and incidents.
Uber's guidelines state that it has a zero-tolerance policy toward discrimination.
Gigi and her sister Bella have been vocal about their faith, especially in the wake of Trump's immigration ban earlier this year (which they protested in NY in January).