Indonesia is on an ambitious mission to offer free meals to 80 million school children - but that hasn’t exactly gone according to plan.

Nearly 80 students across two high schools in Cianjur, south of the capital Jakarta, fell ill after eating the meals this week. Most of those who ended up in hospital have since been discharged.

This is the latest in a series of food poisonings that have been linked to the programme, a signature policy of President Prabowo Subianto.

Authorities investigating the case say the suspected cause is negligent food preparation. Samples from the vomit of students have been sent for lab testing, and police say they have questioned people handling the food, from cooks to packers to delivery workers.

A 16-year-old student told local media that the shredded chicken in the meal had an “unpleasant odour”. “I felt dizzy, nauseous and vomited,” he said.

Across the world, programmes offering free meals to students have proved to be effective in improving health, academic performance and attendance.

But Indonesia’s $28bn (£21bn) version - shaping up to be the most expensive of its kind - has become the target of food safety concerns and heated anti-government protests.

In February, when thousands took to the streets to protest at budget cuts, they aimed their ire at the hefty price of Prabowo’s free school meals: “Children eat for free, parents are laid off,” read one of their protest signs.