A string of blasts tore through Afghanistan’s capital on Wednesday morning in the latest of a series of relentless attacks which have killed scores in recent weeks.

Officials said at least five were killed and up to 15 wounded after suicide attackers and gunmen attacked two police stations in Kabul.

Islamic State group claimed responsibility, the group's Amaq news agency reported.

The Afghan capital has been besieged by a deadly suicide bombing campaign that has killed scores. The beleaguered government is struggling against both a long-running Taliban-led insurgency, and local militants who have sworn allegiance to the Islamic State of Iraq and the Levant (Isil) extremist group. Both groups are expected to attack nationwide elections scheduled for October.

Last week 25 were killed including nine journalists in two blasts near an Afghan intelligence agency office.

A week earlier, an Isil suicide bomber attacked a voter registration centre in Kabul, killing 60 people, while in March the extremists killed 31 at a Shiite shrine in the city.