A Tin Shui Wai secondary school says a teacher who failed to return as scheduled on Sunday from a study trip to the mainland came back to Hong Kong the following day.

The Education Bureau earlier said the teacher in question didn't make it back on May 11 after a four-day mainland study tour to Wuhan for new hires. It said it would require the teacher and the school to submit a report on what happened.

CUHKFAA Thomas Cheung Secondary School said late on Tuesday that the teacher returned to the SAR on the morning of May 12.

"The school has reported the incident to the incorporated management committee and established an investigation committee to follow up on the matter," it said.

"The school is also maintaining close contact with the Education Bureau to learn about and handle the relevant incident. No further comments will be made at this stage."

Internet users had claimed that a secondary school teacher from Hong Kong had been arrested during a trip to Wuhan.