The Investigative Committee said that the suspects are residents of the former Soviet Central Asia region like the bomber, 22-year-old Akbarzhon Dzhalilov, a native of Kyrgyzstan.
The impoverished, predominantly Muslim countries in Central Asia are seen as fertile ground for Islamic extremists, and thousands of their residents are believed to have joined the Islamic State group in Syria and Iraq.
The committee, the nation's top criminal investigation agency, said investigators also found objects that would help advance the probe during a search of the home on St Petersburg's eastern outskirts.
The building's residents had been evacuated before explosives experts went in to check the site. Konstantin Serov, the chief administrator in the city district where the building is located, told Russian news agencies that police deactivated an explosive device at the apartment.
Police in the city are on high alert following Monday's explosion that killed the attacker and 13 other people and wounded some 55.
Today's arrest came a day after law enforcement agencies detained eight Central Asian migrants suspected of acting as recruiters for the Islamic State group and al-Qaida's Syria branch. The investigators found no immediate evidence of their involvement in the subway attack.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
