A percussion bomb exploded in Ankara close to the offices of Turkish Prime Minister Recep Tayyip Erdogan on Monday.
One person was slightly injured.
State television broadcast footage of police looking for further devices and any clues as to who may have been behind the explosion.
Reports say explosives were planted in a car park just 30 metres from the prime minister’s building in the Turkish capital.
On Thursday, a bomb exploded near the ruling AK party’s headquarters in Istanbul, wounding sixteen people.
No-one has claimed responsiblity for either blast, but a group connected to the separatist Kurdistan Workers Party vowed last September to carry out more attacks.
The militant Kurdish group launched an armed struggle for greater autonomy for the country’s southeast nearly three decades ago