Iran is taking steps to prevent anti-establishment protests, with checkpoints appearing across the streets of the capital, internet access restricted, and mass text warnings sent to residents.
In Tehran, people have been telling the BBC about new security checkpoints around the city, where they say residents are stopped and searched.
They have told BBC Persian that some checkpoints are positioned under footbridges and inside road tunnels, after reports that several checkpoints in the middle of roads had been targeted by drone strikes.
A number of Iranian security personnel were killed in Israeli strikes on four checkpoints across Tehran, the hardline Fars News Agency reported on 11 March.
Fars said unofficial counts indicated that around 10 members of the security forces were killed in strikes in four districts of the capital.
