THIRUVANANTHAPURAM: High alert has been sounded in State jails as three remand prisoners tested positive on Tuesday.

One prisoner in Thiruvananthapuram special sub-jail and two prisoners in Kannur sub jail have tested positive.

Following this development, these jails have been more or less in a state of closure.

Out of 55 jails, new prisoners are admitted only in seven jails. They will be put under quarantine for 14 days.