Boris Nemtsov: Thousands Gather for Funeral

Mourners lined up to honor slain Russian opposition leader

Alex Navalny, another opposition leader, was banned from attending the funeral along with several EU politicians.

In line to pay their respects, several mourners doubted the criminal investigation would result in justice.

No arrests have been made and no motive has been established.

"His death represented that there are no limits for those who want to destroy any other opinion in the country except the Kremlin's," one mourner told ABC news.