The attack came on the eve of the official election campaign yesterday as the country prepares for its first ever democratic transfer of power, with the April 5 election viewed as a key test of the effectiveness of the 350,000-strong Afghan security force as foreign troops prepare to exit the country.
"I can confirm that armed men killed Dr Hamdard who was to lead our election campaign team in Herat, along with another team member in Herat city this evening," said Sayed Fazel Sangcharaki, a spokesman for Abdullah.
"Unfortunately two people, namely Ahmad Hamdard and Shujahideen were killed in the fourth district of Herat city this evening. Unidentified gunmen opened fire on them in the middle of street," he said.
The police spokesman only gave one name for the second victim.
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No one has yet claimed responsibility for the attack. But a source close to Abdullah who did not wish to be named told AFP: "We had received some threats in the past week, and two suspects were detained three days ago near our election campaign office in the city.
The source did not elaborate on who was behind the threats.
Abdullah spokesman Sangcharaki said Hamdard had worked with Abdullah during the last presidential campaign in 2009, and lamented the lack of security provided by the government.
"This incident at the beginning of the election campaign is a bad sign as either the security forces are incapable of providing security for the election campaign or they do not take their job seriously," he said.
Taliban insurgents have threatened to target the campaign, and the Afghan police and army face a major challenge with little support from the dwindling number of NATO troops.
The interior ministry hopes to open 6,431 of the 6,845 polling centres, although fears of insurgent violence could keep turnout low.