Around 400 people have gathered in Hong Kong to protest a veteran newspaper editor's dismissal that triggered concerns about press freedom in the semiautonomous Chinese territory.

The dismissal last month of the Ming Pao newspaper's No. 2 editor, Keung Kwok-yuen, came after the newspaper published a report on the "Panama Papers" document leak revealing offshore business dealings of the rich and powerful. The newspaper said Keung was dismissed to save operating costs.

The South China Morning Post said journalists, activists and politicians attended the rally Monday outside the Ming Pao Industrial Center. Protesters carried signs saying "protect journalists, protect Ming Pao, protect press freedom."

Anxiety has grown in recent years among many in Hong Kong about Beijing's growing influence on the territory.