Japan has closed a school in the eastern city of Chiba for the rest of this week, after confirming Covid-19 infections in two teachers who accompanied students to watch the Paralympic Games, according to a city official.

The two were among six teachers of the Kaizuka Junior High School who had tested positive for the disease by Sunday, said the official of the city's education board, after a trip with 18 students in two buses to last Wednesday's goalball event.

One of the school's teachers reported a fever two days before the trip, followed by several more reporting symptoms, with positive tests from August 26 to Sunday, the official told Reuters.