There is no information yet on arrests, law enforcement officials told the agency.
On Sunday, armed militants attacked two Orthodox churches, two synagogues and a traffic police post in Derbent and Makhachkala. More than 20 people died.
The son of the former head of the Sergokalinsky district of the republic, Magomed Omarov, has reportedly created a group of militants to carry out terrorist attacks. According to authorities, the terrorists came from the Sergokalinsky district.
