A roadside bomb struck a tractor carrying people to a wedding in southern Afghanistan, killing 21 civilians in one of the deadliest strikes in weeks, Afghan officials said on Thursday, according to Reuters.

The attack, which took place on Wednesday but was not reported until Thursday morning, was part of a mounting wave of violence two weeks before Afghans go to the polls for a presidential election.

General Sher Mohammad Zazai, commander of an Afghan military unit in Helmand province, said the explosion happened in Garmsir, a district of the province where U.S. Marines launched the biggest operation of the war last month against Taliban militants.

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"It`s the work of the enemy of the nation, it`s the work of the enemy of peace and the work of the Taliban," Zazai said.

Assadullah Sherzad, police chief of Helmand province, said by telephone that the dead included women and children, heading to a wedding in a trailer pulled by a tractor.

Defense Ministry spokesman Zaher Azimi confirmed the incident and the death toll, as did the Interior Ministry in a statement, which said five other civilians were wounded.

A spokesman for the U.S. Marines in the area, First Lieutenant Abraham Sipe, said he was checking the report.

A separate roadside bomb exploded next to a police vehicle on Thursday in another part of Helmand province, the Nad Ali district, killing five policemen and wounding three others, the Interior Ministry said in a statement.

Last month U.S. and British forces launched simultaneous major operations in Helmand province, and they are still fighting to secure areas previously held by Taliban insurgents.

Violence across Afghanistan this year has reached its worst levels since U.S.-led Afghan forces toppled the Taliban in 2001. More than 1,000 civilians were killed between January and June this year, up from 818 in the same period last year, the United Nations said last month.

The operations are meant to expand the Afghan government`s control of the volatile south ahead of an August 20 presidential election, part of Washington`s effort to defeat militants in Afghanistan and Pakistan. The Taliban have vowed to disrupt the election and have called on Afghans to boycott the ballot.

In another incident, a U.S. soldier was killed by a roadside bomb in the western province of Farah while on patrol on Wednesday, the U.S. military said.

At least 71 international troops were killed in July, the worst monthly toll for foreign forces since the start of the war.