According to FSL, Rohini Director Deepa Verma, members from the Cyber Forensics Unit, biology, chemistry and photo divisions visited the spot and collected exhibits.
The team members were wearing Hazmat suits and were likely to be sent to home quarantine, sources said.
They said the building had five floors and two basements, and several shoe racks were found inside it, adding that no electronic device was found.
A Crime Branch team of the Delhi Police also visited the spot in connection with its investigation in the case.
A case has been registered against Maulana Saad of the Nizamuddin headquarters of the Tablighi Jamaat under the relevant sections of the Epidemic Diseases Act and Indian Penal Code for allegedly violating government orders as regards the management of the centre with respect to social, political or religious gatherings.
So far, more than 400 COVID-19 cases and about 15 deaths in the country have been found to be linked to a religious congregation held at the Nizamuddin headquarters of the Tablighi Jamaat last month.
Action against foreign Tablighi Jamaat members was taken after over 2,300 activists, including 250 foreigners, were found to be living at its headquarters in Nizamuddin West last week, despite the 21-day nationwide lockdown imposed to check the spread of the coronavirus.
At least 9,000 people participated in the religious congregation in Nizamuddin last month, after which many of the attendees travelled to various parts of the country. PTI SLB AMP RC