The party did not name the charge. Laptev, who is running in a single-mandate district in Arkhangelsk, was due to report to a police station in the city on Wednesday.
According to Yabloko, its candidate deliberately began campaigning shortly before the vote to reduce the risk of being removed from the ballot. Laptev printed two types of material: booklets for handing out on the street and leaflets for distribution to mailboxes.
On Monday evening, the regional election commission refused to approve Laptev's booklets. A search was carried out at Yabloko's office in Arkhangelsk and the party's batch of campaign materials was seized. The leaflets drew no objections from the election commission, the party's press service said.
In Severodvinsk, police are pursuing distributors of Laptev's leaflets. Women who were delivering campaign materials to mailboxes were detained, and at the police station they were threatened with fines of 20,000 to 30,000 rubles.
"People were simply intimidated, effectively disrupting the distribution to mailboxes of a leaflet that the election commission did not refuse to approve. Now we will try to distribute it using volunteers," Yabloko quoted Laptev as saying.
Yabloko is running two candidates in single-mandate districts in the Arkhangelsk region: Vadim Laptev in the regional capital and Maxim Piskunov in Kotlas.
The party's federal list was barred from the State Duma elections by a Supreme Court ruling on a lawsuit filed by Rodina. That ruling does not apply to single-mandate candidates. As of September 11, the party had retained 103 of its 137 nominated candidates, according to a source cited by Novaya Gazeta Europe. According to DW, at least three candidates reported death threats and demands that they withdraw, and four single-mandate candidates dropped out of the race because of pressure.