At least 17 people have been killed in clashes between ruling party supporters and the opposition as Bangladesh holds a general election.
This is the first national election in the country after more than four years.
Polls have closed and Prime Minister Sheikh Hasina is the overwhelming favourite to win a third term.
But the Bangladesh Election Commission told Reuters it had heard vote-rigging allegations from “across the country” and would investigate.
Hasina’s main rival is serving a jail term for corruption.
The build-up to the poll was marred by violence and accusations of a crackdown against the opposition. Some 600,000 security personnel were deployed to prevent clashes.
Meanwhile, the authorities ordered high-speed internet be shut down until after the vote to prevent the spread of “rumours” that might spark unrest.