The detained mastermind of the Burdwan blast in India, Sajjid, is none but Masum, who was born and brought up in Narayanganj.
He is one of the operatives of the banned militant outfit Jamaat-ul-Mujahideen Bangladesh (JMB).
Indian anti-terror special unit picked up the kingpin Sajjid near Kolkata airport in West Bengal on Saturday. He is held responsible for planning and organising the JMB operation in India.
Hours after his arrest, a 36-year old woman suspected of being involved in a plot to assassinate Prime Minister Sheikh Hasina and Bangladesh Nationalist Party Chairperson Khaleda Zia to carry out a coup in Bangladesh was also arrested in Assam, an Indian state.
Sajjid was declared the most wanted terrorist in recent times and Indian Rupees one million (10 lakh) award for information leading to his arrest was announced soon after October 2 Burdwan blast.
The Jihadi adopted several names to escape the dragnet of the Indian security agencies. Sajjid alias Sheikh Rahmatullah alias Borhan is known as Masum in Narayanganj.
His father Siddique worked with Bawani Jute Mills and he was popularly known as 'Pocha Miah'.
Masum's father died when he was one and a half years old. His family was too poor to afford his living and his elder brother admitted him to a Madrassa at Jatrabari. He passed Dakhil from there.
He came into contact with Shaikh Abdur Rahman, founder of JMB, who was captured and executed following court verdict.
The youth was trained by Ataur Rahman Sunny, a JMB operation commander. Sunny was also captured and hanged for his guilt.He gradually became a notorious Jihadi while living with his mentor Sunny at Tejgaon. Masum changed his name registered with Madrasa to Sajjid.
In 1997 Masum and his accomplices were detained by security forces in Chittagong along with a large number of weapons and explosives.
After five years his elder brother, Mamoon and uncle Afsar sold a house to pay for his bail bond and got him released.
After living with them for some time, Masum left the house and for a long time was not in contact with his family. Only once he called home to inform them that he was going to Afghanistan to join the Jihad.
It is not known when he returned to Bangladesh. His whereabouts were not known to the security agencies for years.
Masum never kept any contact with his family nor did he inform his whereabouts, said his brother Qaiyum, a cook who lives in Farizakanda Lahore house at Bandar in Narayanganj.