Protests have erupted in several Kazakh towns and cities after the Central Asian nation’s government lifted price caps on liquefied petroleum gas.

Public protests are rare – and illegal unless their organisers file a notice in advance – in the tightly controlled former Soviet republic whose parliament is devoid of opposition.

The rallies have involved thousands of people. They began on Jan. 2 – the day after the price caps on LPG were lifted – in the town of Zhanaozen, the site of the deadliest clashes between protesters and police since independence from the Soviet Union.

Protesters in Zhanaozen, an oil industry hub in the western Mangistau province where dozens of people were killed in protests in 2011 after the sacking of oil workers, demanded the price of LPG be halved from 120 tenge that is $0.27 per litre to the level at which the fuel was sold last year.

Retailers have agreed to cut the price by a quarter but President Kassym-Jomart Tokayev’s government has said further cuts are impossible because of production costs.

The price had previously been regulated, but officials said artificially low prices were making LPG production infeasible.

Protests have spread to Mangistau’s provincial centre, Aktau, as well as a worker camp used by subcontractors of Kazakhstan’s biggest oil producer, Tengizchevroil. The Chevron-led venture said output had not been affected.