National security police have arrested three more people in connection with a case involving martial arts classes allegedly conducted with seditious intent.

Officers said the suspects, aged 39 to 50, were taken into custody on Wednesday and Thursday.

They also said offensive weapons were seized during their operation.

Earlier, a coach, 59, and his female assistant, 62, were charged with possessing offensive weapons and possessing firearms without a licence. The pair were arrested in March at a shared training space in Tsim Sha Tsui following an undercover operation.

At the time, police said they had seized various weapons, such as air guns, swords and axes, as well as materials including a picture of university student Chow Tsz-lok who died at the time of the 2019 social unrest.

Officers alleged that items such as Chow's picture were used to incite hatred.