Authorities say a woman carrying a homemade bomb detonates near an upscale restaurant in central Moscow, killing at least three people and injuring 21 others, including some who are critically hurt, according to multiple reports. The explosion occurs on Saturday evening near the restaurant’s summer terrace.

Reporting based on unnamed sources cited by Kommersant indicates that the bomb may have been activated remotely by someone else. Kommersant also suggests the woman who carried the device may not have known it was an explosive. Another outlet reports that investigators describe the bomb as intended to injure and kill guests.

The Moscow Times and the Kathmandu Post both reference Kommersant’s claims about the bomb’s intended targets and the possibility of remote activation. GMA News Online reports the core casualty figures and the location near the restaurant but does not adopt the same speculative details about who set the device or the woman’s knowledge.

Officials continue to investigate the circumstances of the attack and the device’s construction and use.