Russian authorities say at least three people were killed and 21 others were wounded after an improvised explosive device exploded at a restaurant in central Moscow on August 2. The blast turned a busy area of the Russian capital into an active emergency scene as responders and investigators moved in.

Officials said the device detonated inside or at the restaurant, though authorities have not publicly identified who was responsible. Early attention focused on establishing how the explosive was placed and whether the attack specifically targeted the venue or people there.

Investigators are now working through the aftermath of the central Moscow restaurant bombing, examining evidence from the scene and trying to determine who was behind the attack. Russian authorities have described the device as improvised, a detail that points to a deliberate act rather than an accident.

The deadly Moscow explosion adds to security concerns in Russia's capital, where any bombing in a central district is likely to draw intense scrutiny. With the death toll at at least three and the number of wounded at 21, officials continue to piece together what happened and whether more information about the perpetrators will emerge.