ISLAMABAD, Pakistan — Under pressure from the United States and a global watchdog group, Pakistan is prosecuting the founder of the Islamist terrorist group that carried out the deadly 2008 Mumbai attacks on charges of terrorism financing, along with several of his close aides.

Officials said 23 cases had been registered against the man, Hafiz Muhammad Saeed, and more than a dozen of his associates in Punjab Province, after investigations looked into two charities that act as a front for the banned Lashkar-e-Taiba group he founded: Jamaat-ud-Dawa and Falah-e-Insaniat Foundation.

Counterterrorism officials said these charities were involved in raising money for terrorism. A security official, who spoke on condition of anonymity, said Mr. Saeed and more than a dozen of his associates would be prosecuted in antiterrorism courts on charges of terrorism financing and money laundering.

Pakistan formally banned the two charities this year. The prosecution of Mr. Saeed this week was described by officials as a renewed effort by the country to comply with the requirements of the Financial Action Task Force, an international terrorism-financing watchdog.