In brief

• Opposition parties are holding a large rally in New Delhi demanding the resignation of the chief election commissioner.
• The protest targets a nationwide revision of voter rolls, which opponents say removed around 130 million names and could benefit Modi's party.
• Organisers and Congress expect between tens of thousands and a million people, with heavy security in place.

Security tightened ahead of the march

Indian security forces, equipped with batons, shields and riot control vehicles, have surrounded the site of the planned opposition protest in New Delhi on Sunday. Authorities have also warned of traffic diversions along the route of the march. (Indian forces tighten security in Delhi ahead of big opposition protest – The Guardian)

Opposition demands resignation of election chief

The main opposition Congress party has called the march, dubbed 'Chalo Dilli', which starts from the Connaught Place Minto Road junction in central Delhi and ends at Ramlila Maidan. The protest is aimed at Chief Election Commissioner Gyanesh Kumar, whom the opposition wants to step down. (India news: Opposition holds major rally in Delhi over voter roll revisions – DW)

The rally will be led by Congress leader Rahul Gandhi. (India's opposition set to hold mega rally seeking election chief's resignation – BBC News)

What the protest is about

The grievance centres on the Special Intensive Revision, a nationwide exercise to update electoral rolls. Election authorities say it strikes from the lists the names of people who have died or no longer live at their registered addresses. Opposition parties claim the revision could help the Bharatiya Janata Party led by Prime Minister Narendra Modi.

According to reports, the revision has removed around 130 million names from draft voter rolls across India.

Size of the expected crowd

Organisers say hundreds of thousands of people will take part. Congress has also claimed a million people could attend, while the BBC reports that tens of thousands are expected to gather at the grounds from around noon.