The ongoing lockdown imposed in Kerala amid coronavirus spread has been extended by a week and will now be in place till May 23, CM Pinarayi Vijayan said. The decision was taken in view of the high COVID-19 positivity rate, he said. 'Triple lockdown' will be imposed in Thiruvananthapuram, Ernakulam, Thrissur and Malappuram where the rate is high, he added.