“At 14:00 (07:00 Moscow time), 44 out of 72 institutions were checked, no explosive devices were found”, - representatives of emergency services reported.
The letter about mining arrived at 8:30 local time (01:30 Moscow time) and "had an indefinite character", because city officials decided to evacuate.
It's worth reminding that schools, kindergartens and metro stations were “mined” in Moscow last month.
Note that reports of mass mining have been actively circulating since 2019. Then the FSB reported that it blocked dozens of foreign resources from which such messages were sent, but they still continued to arrive.