Raziq was killed in the attack, while two United States citizens and several top Afghan official, including the governor, were wounded, Pajhwok Afghan News reported.
Butler later tweeted a message from General Miller, saying "Today I lost a great friend Lt. Gen. Raziq".
The attack, which took place in the district of Bagram in Parwan province, also wounded three Afghan civilians, said Wahida Shakar, spokeswoman for the provincial governor. Kandahar's provincial governor, Zalmay Wesa, later died of his injuries at the hospital.
Afghan President Ashraf Ghani, in a video address to the nation, told Afghans the situation in Kandahar would soon return to normal.
Initial reports say the attacker was killed.
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North Atlantic Treaty Organisation spokesman Col Knut Peters said the wounded Americans had been caught in the crossfire and had been evacuated.
Responding to questions about newly appointed U.S. special envoy for Afghan peace process Zalmay Khalilzad's meeting with Taliban in Qatar, the spokesman said: "We welcome efforts for a negotiated settlement of the Afghan conflict and will extend all possible support for any such efforts".
NATO, meanwhile, announced that US General Scott Miller escaped the attack unscathed.
"Gen. Miller is unhurt", said Peters.
North Atlantic Treaty Organisation spokesman Colonel Knut Peters said General Miller, who took command of U.S. and forces and the NATO-led Resolute Support mission in Afghanistan last month, was uninjured but two Americans were wounded in the crossfire.
Pakistan on Thursday condemned the shooting incident in Kandahar in which top security and intelligence leadership of the Afghan province was eliminated and hoped for peaceful conduct of upcoming parliamentary polls in the war-ravaged country.
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Raziq took over as Kandahar's police chief after his predecessor, Khan Mahammad Mojayed, was killed in a suicide attack in 2011.
The powerful police chief of Kandahar, General Abdul Raziq, and the provincial intelligence head, Abdul Momin, were shot and killed, they said.
"People and the security forces of Afghanistan have been paying a heavy price due to continued instability and threats from the enemies of peace", Imran Khan said in a statement. "I've seen the maturation of the Afghan security forces", Mattis told reporters on the sidelines of a security summit in Singapore.
Taliban spokesman Zabihullah Mujahid said the Doha discussion was "about ending occupation and working towards finding a peaceful resolution to the Afghan conflict". He narrowly escaped an attack a year ago in which five Emiratis were killed and the UAE's ambassador to Afghanistan Juma Al Kaabi was injured.
"We had served together for many years". Also, in eastern Maidan Wardak province, a suicide auto bomber targeted a military vehicle, killing two Afghan army troops. It came just days ahead of the Afghan elections.
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