I did not know there was a P4 lab in Harbin, but Harbin is said by many reports to have been recently locked down.
Blamed on a student from New York
"A major Chinese city has adopted draconian quarantine measures against the novel coronavirus after a new outbreak was detected there."
"More than 70 people have been infected and over 4,000 are being tested in Harbin after the virus was believed to be 'imported' into the city by a student who had returned from New York, according to media reports."