Afghan security forces keep watch at the site of a blast in Kabul on Tuesday. Omar Sobhani/Reuters

The Taliban insurgent group claimed responsibility for two blasts which it said killed dozens of people in Afghanistan on Tuesday.

The suicide attacks targeted Afghan security forces, the group's spokesman said.

Afghan Taliban send team to Russia after US talks collapse

Taliban suicide car bomber kills 4 Afghan troops

The explosions, in the capital Kabul and central province of Parwan, killed at least 45 people and injured dozens, according to police and health officials.

An explosion near an election rally attended by Afghan President Ashraf Ghani, a health official said, but Ghani was unhurt according to an aide.

Ghani had been due to address the rally in Charikar, capital of Parwan province, north of Kabul, when the suspected militant attack occurred.

"Women and children are among them and most of the victims seem to be the civilians. Ambulances are still operating, and the number of casualties may rise," said Abdul Qasim Sangin, head of the provincial hospital.

An injured man is transported to an ambulance at a hospital, after a blast in Kabul. Mohammad Ismail/Reuters

A local government official said the attack was carried out by a suicide bomber.

"The president is unharmed," Ghani's aide told Reuters.

There was no claim of responsibility from any militant group after the blast.

In a separate incident, an explosion killed at least three people in the centre of Kabul, police officials said. Ambulances and Afghan forces rushed to the blast site.

Taliban commanders have vowed to intensify clashes with the Afghan and foreign forces to dissuade people from voting in the Sept. 28 presidential election, when Ghani will bid for a second five-year term.

Afghan security forces remove remains of the bodies from the site of a blast in Kabul. Reuters

Security at rallies across the country has been tight following threats by the Taliban to attack meetings and polling stations.

Peace talks between the United States and the Taliban collapsed last week. The two sides had been seeking to reach an accord on the withdrawal of thousands of American troops from Afghanistan in exchange for security guarantees from the insurgents.

The talks, which did not include the Afghan government, were intended as a prelude to wider peace negotiations to end more than more 40 years of war in Afghanistan.

Agence France-Presse