An explosion outside Turkey's interior ministry in the capital, Ankara, was a "terrorist attack", the interior minister has said.
Two attackers arrived in a commercial vehicle around 09:30 (06:30 GMT) and carried out the attack injuring two officers, Ali Yerlikaya said.
Mr Yerlikaya said an attacker blew himself up in front of a ministry building and another was "neutralised".
The explosion happened just hours before parliament was due to reconvene.
It is not clear who the attackers were. No-one has claimed the attack.
A senior Turkish official told Reuters news agency the attackers had hijacked the vehicle and killed its driver in Kayseri, a city 260km (161 miles) south-east of Ankara.
One of the injured officers suffered shrapnel injuries, he added.
The first media reports of an explosion also spoke of gunfire heard in the area. Emergency services rushed to the scene, with police blocking several surrounding roads.
"Our struggle will continue until the last terrorist is neutralised," Mr Yerlikaya wrote on social media.
Ankara police said it was carrying out "controlled explosions" of "suspicious packages" to prevent other explosions.
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