Two of them - aged 20 and 21- were reportedly hit in the face and rushed to hospital with burns, while the attacker was arrested by police. She spoke on condition of anonymity, per the French judicial system.
People once used knives, now acid is a weapon of choice in the United Kingdom .
No other information on where the USA tourists were from was released.
The attacker, a 41-year-old woman, was arrested at the scene, Reuters reported.
British Airways plane to London evacuated at Paris airport 'over DIRECT THREAT'
James told Mirror Online : "The pilot then said there had been a direct security threat involving our flight specifically". The incident comes days after a bomb was detonated on a District Line Tube train at Parsons Green station in West London.
Boris Johnson sets out vision of Brexit
A Government spokesman said: "We believe that the negotiations on the future partnership should begin as soon as possible". The Brexit heavyweights have told the prime minister to boost NHS spending by £10bn a year when Britain leaves the EU.
American who fought for ISIS captured by SDF
The Syrian Arab Army , backed by Russian Federation and Iran, has simultaneous operations ongoing in Deir ez-Zor. The strikes had only hit targets in areas under the control of Islamic State, he said.
The incident was not terror-related, French officials confirmed to Fox News.
The attack is not believed to be terror related as the attacker did not yell out any terror-linked threats, a spokeswomen for the prosecutor's office said.
One of the two women was suffering from partial loss of vision. Paris prosecutor Francois Molins told columnists the two suspects "were preparing to do a fast approaching, fierce activity" on French an area.
In January 2016, a 15-year-old Turkish Kurd was arrested after attacking a Jewish teacher on a Marseille street. He told police he acted in the name of the Islamic State group.