Tokyo has reported a record rise in cases for three days in a row, including 3,865 on Thursday.
Tokyo is currently under less-stringent measures that focus on shortened hours for bars and restaurants but have proven less effective at slowing the spread of the coronavirus.
Tokyo logged 591 new cases of coronavirus infection on Thursday, a slight dip from when the state of emergency began in the capital last month.
Prime Minister Yoshihide Suga is set to formally announce later on Friday a state of emergency for Tokyo, Osaka and its two western neighbors Kyoto and Hyogo from April 25 through mid-May.
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