Tanzanian authorities have arrested dozens of people ahead of planned anti-government protests, intensifying a crackdown on dissent as activists demand democratic reforms and the release of jailed opposition leader Tundu Lissu amid heightened security across the country.

Tanzanian authorities have detained dozens of people ahead of anti-government protests planned for Tuesday, as security forces moved to prevent demonstrations demanding political reforms.

The planned protests coincide with the 72nd anniversary of the ruling Chama Cha Mapinduzi (CCM) party and have been organised largely by young activists calling for greater democratic freedoms and the release of opposition leader Tundu Lissu.

Military warns against protests

Speaking on Sunday, army spokesperson Sylvester Mangure warned that any demonstrations would not be tolerated following the government's recent ban on political rallies.