Farmers blocked highways and held demonstrations in many rural areas in northern India on Friday to protest over a range of grievances that have also led tens of thousands to march toward the capital in tractors and wagons.

Farmers in the northern states of Haryana and Punjab held sit-ins near toll plazas on major highways in the strike, supported by some trade unions. Authorities advised commuters to plan routes carefully to avoid blocked roads.

Tens of thousands of farmers began a protest march toward New Delhi earlier this week to demand , but were stopped by the police about 200 kilometers (125 miles) away from the capital. The farmers are camping on the border between Punjab and Haryana after being blocked by concrete and metal barricades. Police detained some protesters.

Authorities have also suspended mobile internet service in some areas of Haryana, blocked social media accounts of some protest leaders and used drones to drop tear gas canisters on the protesters.

The farmers鈥� march comes two years after Prime Minister Narendra Modi鈥檚 government faced similar protests that continued for more than a year. At that time, farmers camped on the capital鈥檚 outskirts to demonstrate against new that were later withdrawn.

At the heart of the latest protests is a demand for legislation that would guarantee minimum support prices for all farm produce.

Currently, the government protects agricultural producers against any sharp fall in farm prices by setting a minimum purchase price for certain essential crops, a system that was introduced in the 1960s to help shore up food reserves and prevent shortages. The farmers want legislation that will apply the protection to all produce.

The protesting farmers are mostly from Punjab and Haryana and are relatively better-off than farmers in other Indian states. But increasing cultivation costs and rising debts have led them to overproduce rice and wheat, crops for which they get a minimum support price, or MSP. However, those water-guzzling crops have also depleted the water table in the two states and forced farmers to look for other alternatives. Farmers say a guaranteed minimum support price for other crops would stabilize their incomes.

Farmers are also pressing the government to follow through on promises to double their income, waive their loans and withdraw legal cases brought against them during the earlier .

Some economists say that implementation of the demands could risk food inflation. However, experts also point out that a key cause of the farmers鈥� frustration is the lack of implementation of policies that are already in place.

鈥淭he system of MSP is already there, but the government doesn鈥檛 follow through on what it is promising,鈥� said Himanshu, an economist at New Delhi鈥檚 Jawaharlal Nehru University who goes by his first name.

The system of guaranteed prices 鈥� which applies to 23 crops 鈥� has been in place for decades, but the government mostly pays those prices for crops like rice and wheat, he said. 鈥淔or the remaining 21 crops, the government hardly buys at those prices. That鈥檚 a problem. That鈥檚 why they want a guarantee.鈥�

Several meetings between farm leaders and government ministers have failed to end the deadlock.

Agriculture Minister Arjun Munda, who met farm leaders on Thursday, said the talks were positive and the two sides will meet again Sunday.

鈥淲e believe we will all find a solution together peacefully,鈥� Munda told reporters.

The protests come at an important time for India with elections to be held in a few months. Modi is widely expected to secure a third successive term.

In 2021, Modi鈥檚 decision to repeal the agricultural laws was seen as a move to appease farmers, an influential voting bloc, ahead of crucial state polls.

Sheikh Saaliq And Krutika Pathi, The Associated Press