The reason behind the detention could not be known immediately.
Hummam was picked up in front of the main gate of Dhaka Metropolitan Chief Court and session judge court around 12:50pm, said one of his counsel Chowdhury Mohammad Galib Ragib.
Hummam's personal secretary Minhaj Uddin Chowdhury Shibli said he was in a white Nissan car when some three to four people circled the vehicle and picked him up.
Galib said he heard that the DB personnel tell Hummam that they were picking him up in connection to another case.
When Farhat asked the men their identities they said they were from DB and she should let them do their job.
A family sources claimed that two people were following him for last two days.
DMP spokesperson Md Masudur Rahman said they were yet to receive any such information. However, a DB sources said Hummam was under their custody.
Hummam and his mother Farhat Quader Chowdhury went to court to attend a hearing in a case against them filed under the ICT Act, yesterday afternoon.
On Oct 1, 2013, the war crimes tribunal found Hummam’s father Salauddin guilty of 1971 war crimes and awarded him the death penalty.
That verdict was leaked on internet before it was made public.
The tribunal’s prosecution filed a case against Hummam, Farhat, lawyer Fakhrul Islam and four others over the leaked verdict.
The court later granted Farhat bail but sent the four others to jail rejecting their bail pleas. The court yesterday fixed August 14 as verdict day in the case.