WASHINGTON, Oct 20 (Reuters) - UN experts called on Tuesday for an independent investigation into Indian authorities' conduct in a recent crackdown on protests, where they said demonstrators had sustained injuries and some reported being subjected to ill-treatment.

Opposition political parties and student organizations have held protests this month in India demanding Chief Election Commissioner Gyanesh Kumar's resignation over a revision of voter ​lists that they say favors Prime Minister Narendra Modi's Bharatiya Janata Party.

"Despite the non-violent nature of the assemblies, law enforcement agencies have reportedly deployed force against unarmed students, including lathi charges, and have prevented thousands from joining the protests," the two dozen experts said in a statement, referring to batons used to break up crowds.

"We call on the authorities to immediately cease the use of excessive force, rescind blanket assembly bans, and refrain from the misuse of digital surveillance, including through biometrics, and internet disruptions," they said.

India has repeatedly dismissed such criticism and cast it as interference in the country's internal affairs, including when the UN human rights office earlier this month expressed concerns over mass detentions in relation to the latest protests.

Protesting groups say the removal of 130 million names from voter lists led to eligible voters being disenfranchised, which disproportionately affected poor and homeless people as well as ethnic minorities including Muslims, who are unlikely to vote for the Hindu nationalist BJP. The BJP ​and India's Election Commission deny this.

The Election Commission says it was removing duplicate, deceased, shifted and otherwise ineligible voters and that anyone excluded in error can pursue appeals.

UN ​experts are appointed by the UN Human Rights Council to monitor and document specific human rights crises ​but are independent of the organization itself.

(Reporting by Kanishka Singh in Washington; Editing by Sonali Paul)