Earlier, seven accused, including the main culprits, were arrested during separate raids on June 29, July 1, July 4 and July 9.
Farhad Mohammad Sheikh, described by the NIA as their 'close criminal associate' and the last man to be arrested so far in the case, was also remanded to further police custody.
Kanhaiya Lal (48) was hacked to death on June 27 by Riaz Akhtari and Ghouse Mohammad who said in a video posted online that they had avenged an insult to Islam.
Fayyaz Ahmed Bhatt (30) was held on Sunday from Badgam in the northern Union Territory with the help of police there, the VP Road police station official said.
Tailor Kanhaiya Lal was killed on June 28 in the north-western state, while chemist Umesh Kolhe was murdered a week earlier on June 21.
Sangh considers Indians as one and the outfit is working towards uniting them, RSS’ publicity in-charge Sunil Ambekar said.
The gruesome attack by Riaz Akhtari on the tailor was recorded on a phone by Ghouse Mohammad, and the video was posted online.
The march began from the Mandi House area and will culminate at Jantar Mantar. BJP leaders Tajinder Pal Singh Bagga and Kapil Mishra were also present in it.
Udaipur murder: Facebook removes video glorifying the crime; suspected Pakistani numbers recovered from PFI member
Looking at a possible threat to communal harmony in Udaipur, the police wrote a letter to Facebook seeking its removal and the video was immediately taken down.
The Congress has alleged that one of the prime accused in the killing of tailor Kanhaiya Lal in Udaipur was a BJP member.
Sources said Mohsin was arrested on Monday for his alleged involvement in the conspiracy to kill Lal and in carrying out a reconnaissance of his shop.
Udaipur murder: VHP, Bajrang Dal members join probe in provocative slogans case; let off on police bail
Hindu outfits like the VHP and Bajrang Dal have been holding protests in various parts of the country against the murder of tailor Kanhaiya Lal last Tuesday by two men.
Riyaz is seen wearing the BJP’s neck-band while accepting party membership from Karni Singh Shaktawat, the district convenor of the BJP’s membership campaign in 2019.
The main demonstration was held at Statue Circle where ‘Hanuman Chalisa’ was also played on loudspeakers. Officials said permission for the demonstration had been granted.
The main demonstration was held at Statue Circle where 'Hanuman Chalisa' was also played on loud speakers.
He also targeted Congress saying the grand old party is dismissing the Udaipur incident as a normal murder and not a terrorist act which has exposed its 'real face'.
'Is this a conspiracy to incite communal riots?': Baghel asks BJP to clarify stand on its 'links' with Udaipur murder accused
On Saturday, the Congress had alleged that the main accused in the Kanhaiya Lal murder case in Udaipur was a member of the BJP.
Udaipur-Amravati killings: Finger-pointing won't do, governments, people must work to normalise situation, says Kejriwal
Queried on the two murders, Kejriwal said whatever was happening in the country at present was not good and that he condemns it in the strongest way possible.
The officials said that an IPDR analysis would be carried out on their phones to check their activities on the Internet.
This has come as a major setback for the tourism industry, which is the main source of livelihood for a majority of people in the city.