Tokyo reported 13 new cases of novel coronavirus infection on Monday, a level slightly lower than the 14 logged on the previous day, media reports quoted Tokyo Metropolitan Government sources as saying.

There are still lingering concerns, however, that some citizens in the capital may be disregarding publicly urged caution in preventing the spread of the virus, especially after the nationwide state of emergency was lifted on May 25.

Many of the recent cases have been reported from nightlife spots — hostess bars and host clubs — in the Shinjuku adult entertainment district. Authorities are trying to identify the cluster infection routes and take steps to keep further virus spread at bay.

Monday's figure brings the total of COVID-19 infection cases in the capital to 5,396.

Since the state of emergency was lifted nationwide late last month, the number of new cases reported in the capital increased, prompting Gov. Yuriko Koike to issue the so-called Tokyo Alert last week.

It serves as a call for caution but the phases for reopening businesses that have already been implemented will not be moved back.