A Kashmiri demonstrator (right) throws a stone towards an Indian policeman during a protest against by-polls in Srinagar on April 9, 2017.

Six people were killed and more than 100 injured on Sunday when police clashed with protesters during a by-election in Srinagar in India’s disputed Kashmir region, officials said.

Separatist factions in Kashmir had called for a boycott of the vote, resulting in heightened security and low voter turnout as the polling began.

In Budgam district, police initially used tear gas against protesters who were throwing stones, but then opened fire, killing six people, the senior police official told Reuters.

More than 100 were injured during the clashes across central Kashmir on Sunday, the official said. At least 70 polling stations were shut due to the violence.

“There were more than 200 incidents of violence…which included stone-pelting, petrol bomb attacks, setting ablaze of a polling station,” the state’s Chief Electoral Officer Shantmanu told reporters.

Turnout

The “tentative turnout” was 6.5 percent, Shantmanu said, adding that a decision on re-polling in violence-hit areas would be taken later.

The by-election in Srinagar is being held to fill a vacant seat in the Lok Sabha, India’s lower house of parliament. A second by-election in the state for a separate Lok Sabha seat is set to take place on April 12 in Anantnag. The results of both polls are expected to be announced on April 15.

There have been a spate of protests since the killing by security services of separatist leader Burhan Wani.

The violence has killed 84 civilians and wounded more than 12,000 civilians and security force personnel.