Twitter crashed early Wednesday, just days after owner Elon Musk axed hundreds of staff and soon after a cryptic threat from China.

According to Down Detector, reports started coming in of issues just before 4:50 a.m. — with more than 4,000 by just after 5:30 a.m.

More than half of those complaints came from people unable to access the site by app.

It was not immediately clear what caused the crash, with Chief Twit Musk unable to use his own site to share updates.

It comes just days after the once-again world’s richest man laid off another 200 staff — and soon after Musk got a cryptic warning from China’s state-run Global Times newspaper not to share theories about the origins of COVID.