Silent opposition counts on viral votes in Bangladesh election

Shut out by mainstream media and too scared to hustle on the streets, Bangladesh's main opposition party has been reduced to social media lobbying for votes in this week's national elections.

Two weeks into the campaign, Prime Minister Sheikh Hasina has addressed hundreds of thousands of people in rallies across the country as she seeks a record fourth term.

Public gatherings by the opposition Bangladesh Nationalist Party (BNP) are tiny by comparison.

Its leader Khaleda Zia is serving a 17-year jail term for a graft conviction, which the party says is a politically motivated attempt to sideline Hasina's chief rival.

The BNP says many of its candidates have been too scared to campaign in public and fear violent intimidation by ruling party followers or arrest by authorities.

More than 150 of its candidates have been attacked, 15 arrested and thousands of party activists injured in clashes with rivals from the ruling Awami League, according to the BNP.

At least six supporters from both parties have been killed in election clashes.

Fearing bloodshed, the BNP has instead turned to Facebook to canvass support from Bangladesh's 100 million voters ahead of Sunday's election.

An online plea by BNP secretary general Fakhrul Islam Alamgir to the nation's younger voters went viral in recent days.

The three-minute video was released on Friday night and was shared tens of thousands of times over the weekend.

The Awami League wants to "create an environment of fear so that you lose interest in voting on the morning of December 30," he says in the post. "You can prevent vote robbery. Democracy must be saved."