New York bombing suspect Akayed Ullah, gave a leaflet of militant leader Jasim Uddin to his wife and asked her to read it in September last.
It indicated that he was self-radicalized.
Akayed's wife Jannatul Ferdous Jui gave the information during an interrogation, said chief of Counter Terrorism and Transnational Crime unit of Dhaka Metropolitan Police (DMP) Monirul Islam on Wednesday.
Quoting Jui, the CTTC chief said she also discussed the content of the leaflet with her husband.
He said Akayed might have been self-radicalised through internet after going to the USA as he had no criminal record in Bangladesh. Monirul also said police didn't find Akayed's link in any militancy activities in Bangladesh.
During his stay at home, most of the time he remained busy with his laptop, Monirul said quoting Akayed's wife.
"We are interrogating his family members to know details about Akayed," said chief of CTTC.
During interrogation, Akayed's wife Jannatul Ferdous Jui revealed information about him. Monirul said Akayed's wife informed police that Akayed visited Bangladesh on September 18.
During his stay in Bangladesh, he visited outside of Dhaka several times but she does not know where he visited. Besides, he spent most of his time with family, Monirul said quoting Jui, reports UNB.
He said that police now interrogating Akayed's brother-in-law Joy.
Earlier, Police detained Akayed's wife Jannatul Ferdous Jui, his father-in-law Zulfikar Haider, mother-in-law Mahfuza Akhter from the city's Jigatala area on Tuesday for interrogation.
The CTTC team is interrogating them for the second day since Wednesday morning.