(Adds IS claim, blast in north, updates casualties)
By Qadir Sediqi and Sayed Hassib
KABUL, April 22 (Reuters) - A suicide bomber blew himself up outside a voter registration centre in the Afghan capital Kabul on Sunday, killing at least 31 people and wounding more than 50, most of them waiting in line to receive identity cards, officials said.
Islamic State claimed responsibility for the attack on a project of key importance to the credibility of President Ashraf Ghani's Western-backed government, which has pledged to hold parliamentary elections this year.
Interior Ministry spokesman Najib Danesh said a bomber on foot approached the centre where officials had been issuing identity cards as part of the registration process for voters for the election scheduled for October.
A spokesman for the ministry of public health said at least 31 people were confirmed dead and 54 wounded. The explosion destroyed cars and shattered windows in nearby buildings, leaving rubble strewn across the street.
It was the most serious attack in Kabul since about 100 people were killed in January by a bomb concealed in an ambulance.
After weeks of relative calm, the blast took place in Dasht-e Barchi, an area of western Kabul inhabited by many members of the mainly Shi'ite Hazara minority, which has been repeatedly hit by attacks claimed by Islamic State.
"There were women, children. Everyone had come to get their identity cards," said Bashir Ahmad who had been nearby the blast, which occurred despite heightened security measures following the January attack.
Voter registration centres have been set up across Afghanistan ahead of long-delayed parliamentary and district council elections due to be held in October and there have been serious concerns that militants might attack them.
President Ghani has been under heavy pressure from his international partners to ensure the elections are held this year, ahead of a presidential election due in 2019 although there has been widespread scepticism that they will take place.
"They should be keeping the country safe, if they can't, someone else should be in their place," said Sajeda, who was wounded in the blast along with three other members of her family as they lined up for their cards.
Voter registration began this month but there have already been a number of attacks apparently aimed at disrupting the preparations.
Also on Sunday, a roadside bomb near a voter registration centre in the northern city of Pul-i Khumri killed six members of a family and wounded three as they drove past the site although there was no indication the attacks were linked.
Unless the process of registering millions of voters, many of whom do not have national identity cards, can be completed before winter sets, the vote would almost certainly have to be postponed until next year.
According to U.N. figures, more than 750 people have been killed or maimed in suicide attacks and bombings by militant groups during the three months to March. (Additional reporting by Abdul Aziz Ibrahimi, Sardar Razmal in KUNDUZ, Ahmad Tolba in CAIRO; writing by James Mackenzie Editing by Robert Birsel)
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