The US has been introducing new measures to increase the economic pain on Iran after negotiations collapsed and no end to the intermittent fighting appears in sight Iran's security chief Mohsen Rezaei says Tehran will announce a restricted zone around the Strait of Hormuz. Key points and original sources are listed below.

• The US has been introducing new measures to increase the economic pain on Iran after negotiations collapsed and no end to the intermittent fighting appears in sightS1

• Iran's security chief Mohsen Rezaei says Tehran will announce a restricted zone around the Strait of Hormuz.S2