A Myanmar military court has found Japanese journalist Kubota Toru guilty of incitement and other counts.

Sources say the tribunal in Yangon on Wednesday sentenced him to seven years in jail for violating laws related to telecommunications and three years for incitement.

Details of the ruling are unknown as it was made behind closed doors, and his lawyer was not allowed to attend.

Kubota was detained in Yangon by security authorities in July. They said he entered the country on a tourist visa and filmed protests. He faced charges including violating the immigration law.

The Japanese Embassy in Myanmar says it will continue urging the Myanmar side to release the journalist early.

Myanmar authorities have also detained a former British ambassador to the country on suspicion of violating the immigration law.

An Australian man who was an economic adviser to ousted leader Aung San Suu Kyi was recently sentenced to three years in prison for violating the official secrets law.