Mozambique's parliament Thursday approved a tough new anti-terror law that imposes stiff prison sentences for convicted jihadis, but also for anyone spreading misinformation about the country's insurgency.

The measure, which calls for up to 24 years in prison for those found guilty of "terrorism" offenses had broad support, but the opposition fears the clauses on misinformation could be used to crack down on media.

"Mozambique is experiencing cruel, direct impacts from terrorist attacks in the north," government spokesman Nyeleti Mondlane told parliament.

"We want to strengthen the law to combat terrorism," he said.

Some 3,900 people have been killed and 820,000 displaced from their homes since jihadi unrest erupted in northern Mozambique in October 2017.

More than 3,100 troops from several African countries moved into the troubled Cabo Delgado province in July last year and have retaken much of the territory.

The violence forced a halt to work on Mozambique's gas fields, including a $20-billion project from TotalEnergies.

The new bill is Mozambique's latest effort to tame the violence.

It also contains provisions calling for up to eight years behind bars for "anyone who intentionally disseminates information according to which a terrorist act was or is likely to be committed, knowing that the information is false."

Arnaldo Chalawa, from the opposition RENAMO party, said: "The anti-terrorism law must not put at risk the right of the press or expression."

The ruling party, FRELIMO, had enough votes to pass the law without opposition support.

President Felipe Nyusi has already indicated that he will sign it.