A journalist recovers after the confrontation with police |
Most were held in Karachi and several detained in Hyderabad.
Police baton-charged the Karachi journalists after they tried to stage a protest march. Some of them were hurt.
When President Pervez Musharraf imposed emergency rule on 3 November, radio and TV news was banned, as was criticism of the government.
Country-wide
Heavy contingents of police were deployed on roads to the Karachi Press Club to stop the rally there.
It was part of a country-wide protest organised by the Pakistan Federal Union of Journalists (PFUJ) against the media curbs.
The journalists were planning to hold a demonstration outside the Karachi offices of the ARY TV channel, one of half a dozen news channels that cable operators stopped airing after the emergency was imposed.
The BBC's M Ilyas Khan in Karachi says police beat up a number of journalists in front of the press club entrance.
The arrests came shortly after the government said it released some 3,400 people jailed under emergency rule.
The release of political opponents has been a key demand of opposition parties who are threatening to boycott parliamentary elections in January.
A number of leading political figures are still being held.