Two Taliban suicide bombers attacked the Afghan capital this morning, killing at least seven people and wounding more than 15, government officials said.
The Taliban, fighting to oust foreign forces and the US-backed government, claimed responsibility for the attacks in the east and west of Kabul.
"Double martyrdom attack has rocked #Kabul city this morning amid current year's ongoing #Khaibar operation," the Taliban said on Twitter, referring to their yearly summer fighting offensive.
Officials from Afghanistan and the United States signed a deal on Tuesday allowing American troops to stay in the country after the end of the year, filling a campaign promise by new President Ashraf Ghani.
There has been an explosion near the airport in Afghanistan's capital as the country's new president was being sworn in, Reuters reported citing a witness.
Local security forces said a suicide bomber attacked a security checkpoint near the airport minutes before Ashraf Ghani was sworn in as president.
It was not immediately clear how many people had been killed and injured in the explosion, the report stated.
A magnetic bomb attached to an Afghan army vehicle exploded this morning, a day before the new president is inaugurated.
A loud explosion in the Afghan capital Kabul a day ahead of the new president's inauguration was a bomb hitting a military truck.
Police said one person was wounded by the magnetic bomb. A Reuters witness said the bomb tore off the driver's seat door.
Najib Danish, Interior Ministry deputy spokesman, told the news agency: "At 9:15 this morning, a sticky bomb attached to an Afghan army vehicle exploded in Zanbaq Square ... only injuring the driver."
A loud explosion was heard in the diplomatic quarter of the Afghan capital Sunday morning, a day before the inauguration of a new president.
Sirens were heard minutes later, but the cause of the explosion was not immediately clear, Reuters reported.
Security is tight in Kabul ahead of Monday's inauguration of new President Ashraf Ghani, who will replace long-time leader Hamid Karzai just before most foreign troops withdraw from the violence-racked country.
The Taliban have claimed responsibility for a suicide car bomber that attacked a foreign motorcade in Kabul, killing at least three international troops and injuring 13 people.
The blast happened just off a busy road that runs from the US Embassy to the airport, near the country's Supreme Court.
The Taliban claimed responsibility for the attack in an emailed statement to journalists. The international military coalition ISAF did not have any immediate information.
The attack comes as the country's two presidential contenders continue negotiations to form some sort of national unity government.
A bomb attack near the US Embassy in the Afghanistan capital Kabul has killed four international troops, an official Coalition statement has said.
At least five were wounded in the blast, which was claimed by the Taliban. Afghan Deputy Interior Minister Mohammad Ayub Salangi earlier said on Twitter a suicide car bomber had targeted a convoy of foreign troops.
A huge blast has been heard in the Afghan capital Kabul. A large plume of smoke could be seen above the city, Reuters reports.
The cause of the explosion was not immediately known and no information on casualties was immediately available.
Hundreds of Taliban fighters have launched an offensive in Logar Province, near the Afghan capital Kabul, Reuters have reported.