Pashinyan and two other opposition politicians "were detained as they were committing socially dangerous acts", the prosecutor general's office said in a statement.
Demonstrators blocked streets in the center of Yerevan in opposition to a change of government that will see Sarkisian maintain huge influence.
According to unofficial results and exit polls, Aliyev has won more than 80 percent of the vote in the presidential election
Voters will choose from 8 candidates; new president to rule for 7 years
284 candidates have been nominated for 125-seat parliament
A Yerevan court found Zhirair Safilyan guilty of planning the attack in which 20 anti-government gunmen took over a police station in the capital in July 2016, killing two officers and taking several others hostage.
Georgian president confirms one of the abductees was killed
Meeting between foreign ministers due in March will discuss safe zones in Syria, says Russian deputy foreign minister
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