Fresh violence has erupted in the Afghan capital, Kabul, on the eve of the country's presidential election.

Explosions and gunfire were heard as troops battled and killed three attackers who raided a bank close to the presidential compound, the BBC reported.

The Taliban has vowed to disrupt the election and said it was behind the raid, but this could not be confirmed.

The government has asked the media not to report violence on election day to avoid deterring people from voting.

But the move has been heavily criticized, and journalists said they would ignore it.

"It is a democratic day, a very important day for our independence, and this type of ban does not sit well with democratic principles," Rahimullah Samander, president of the Afghanistan Independent Journalists' Association, said.

On Tuesday more than 20 people were killed in attacks across the country, including a suicide blast in Kabul.

Meanwhile local officials in Ghazni province said that international forces had mistakenly killed four Afghan police overnight near the town of the same name.

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