Iranian state TV reports that 10 people have been killed amid nationwide protests, without elaborating

Iranian state TV is reporting that 10 people have been killed amid nationwide protests, without elaborating.
The state TV report Monday made the reference in a package on the ongoing demonstrations that began Thursday.
Authorities have previously confirmed four deaths. It was unclear where the others occurred.
The protests began Thursday in Mashhad over economic issues and have since expanded to several cities. Hundreds of people have been arrested.