Several other attackers were outside the building shooting at police officers.
"There are many areas in the province under a high security threat, and this site was one of those areas", he said, adding that the center was some 30 kilometers (20 miles) west of the provincial capital of Qala-e Now.
The Taliban and Daesh group claimed responsibility for the attacks on two police stations in the Afghan capital, in which over a dozen people were wounding as well.
At least six injured were shifted to hospital by rescue teams after the attacks.
Though no group has claimed responsibility for the abduction of the Indians, Afghan officials have blamed the Taliban.
In both places, gunmen attempted to enter official buildings, prompting clashes with the security forces.
Gunfire was also reported during the "cleanup operation" following the blast.
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And 55 per cent of Twitter users knew their privacy settings, and 58 per cent knew how to use them. Facebook users to demand information on exactly what data companies have on them.
But despite repeated government pledges to tighten security, hundreds of people have been killed and wounded in attacks in the city since the beginning of the year and authorities have appeared powerless to stop the bloodshed.
"We are rushing ambulances to the blast site and cordoning off the entire area", said police spokesman Hashmat Stanekzai.
Majroh said one person was killed and eight others wounded.
Interior Minister Wais Barmak in talks with reporters confirmed that standoff is underway and Unit of Special Forces have been trying to eliminate the attackers and bring the situation under control. "Their internal supporters will be dealt with as a secondary target", the Taliban said.
The attacks happened just over a week after twin blasts in Kabul killed 25 people, including AFP chief photographer Shah Marai and eight other journalists.
Violence in Afghanistan has surged since the Taliban launched its annual spring offensive, dubbed as "Al Khandaq", two weeks ago.
With preparations for elections now underway across much of the country, more attacks are expected on voter registration centres following a blast in one centre last month in which 60 people lining up for identity cards were killed.