Police in the southern Pakistani city of Karachi took a local businessman into preventive custody on Sunday after a letter containing traces of anthrax was sent to the country's biggest newspaper.
The name of businessman Mohammad Saleem was used in the letter sent to the offices of the Jang daily last week, which contained a suspicious white powder.
"We have taken Mohammad Saleem into preventive detention as we are still examining under what law anthrax cases can be prosecuted," police official Munir Sheikh said.
"The accused has denied his involvement, but we are not satisfied with his initial statement," Sheikh added.
Police on Saturday detained a general secretary of the Pakistan Mehran Welfare Education Society, whose letter-head was on the letter sent to the newspaper.
President Pervez Musharraf on Saturday confirmed that the letter had contained anthrax spores but said nobody had been infected. A similar letter had been sent to the Karachi office of the US computer company Dell. Bureau Report