The Investigative Committee said it was holding two suspects - a maintenance foreman, Valery Bashkatov, and his assistant Yury Gordov - and added that high-ranking officials could also be arrested.
"The detained have already been questioned," the committee said, noting the men will soon be formally charged with safety breaches.
Twenty-one people died and more than 200 were wounded yesterday when a metro train braked abruptly and three carriages derailed and crumpled.
The death toll from the rush hour crash has since climbed to 22, an emergencies ministry spokesman told Russian news agencies today.
The Investigative Committee said that the metro had since May been carrying out work to install a set of points - a section of track allowing trains to change lines - to launch a section of new tracks.
The suspects had overseen the works, said the committee, which reports directly to President Vladimir Putin.
The committee said in a statement it believed "the works have not been conducted in a proper manner."
"A set of points was fixed in place with a piece of regular 3-millimetre wire which snapped."
Putin yesterday had ordered a criminal probe in the crash, the worst accident in the Moscow metro's 80-year history.
City authorities declared today a day of mourning as calls mounted to urgently improve the marble-clad but overcrowded metro, one of the world's busiest.
The subway, which first opened in 1935 under Stalin, transports some 9 million passengers every day.
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
