The Bombay High Court today slammed Mumbai Police for arresting cartoonist Aseem Trivedi on frivolous grounds, saying its action breached his freedom of speech and expression. The Court was hearing a PIL filed by lawyer Sanskar Marathe, claiming Trivedi's arrest was illegal and unjustified. The Kanpur-based cartoonist, arrested last Saturday on sedition charges, was released two days back after the High Court granted him bail.Observing that Trivedi's arrest was prima facie arbitrary, a division bench of Justices D Y Chandrachud and Amjad Sayyed directed the police to file a comprehensive affidavit by October 12, explaining the grounds on which the charge of sedition was applied. The Judges said, they intended to lay down certain parameters for application of the law of sedition. The Bench said, the sedition law was a pre-independence provision when government wanted protection from the citizens.The court wanted to know Maharashtra government's stand on the issue and asked if it intends to drop the sedition charge on the cartoonist. The court akso added Trivedi as respondent in the PIL.