KABUL, Afghanistan — A suicide bomber in a car packed with explosives struck a British Embassy vehicle Thursday, killing six people, including a British civilian security officer, and wounding more than 34.

An Afghan working for the embassy was killed and a second British member of the security team was among the injured, according to a statement from the U.S.-led military coalition in Afghanistan.

Later, two suicide bombers set off their explosives near the office of an international nongovernmental organization in Kabul’s diplomatic neighborhood, injuring a foreign national, Afghan officials said. Witnesses said the explosions were followed by gunfire and targeted a compound belonging to International Relief and Development, an American nonprofit group that is one of the largest recipients of U.S. government funding in Afghanistan.

The Taliban claimed responsibility for both attacks, an apparent show of strength one week before an international meeting in London at which the governments of Britain, the U.S. and other nations are expected to renew financial and diplomatic support for the new Afghan government and mark the end of the NATO combat mission in Afghanistan.

The British Embassy vehicle was struck as it traveled on a main road leading to the eastern city of Jalalabad, the site of another insurgent attack this week that killed two soldiers belonging to the U.S.-led military coalition.

Pictures circulated on social media showed an armored sport-utility vehicle flipped onto its side, its engine charred and hood twisted. It was not immediately clear who had been traveling in the vehicle.

Five children were among the injured, said Health Ministry spokesman Kaneshka Turkistani.

Attacks on international personnel and Afghan civilians have increased markedly over the past week. The violence poses a direct challenge to President Ashraf Ghani, who has broad popular support after a contested runoff election in June but has yet to name a Cabinet.

Ghani has also taken steps to expand cooperation with international forces, raising pressure on the insurgents. The Afghan Senate approved a bilateral security agreement with the United States and a similar status-of-forces agreement with NATO on Thursday that paves the way for about 12,000 international forces, including about 10,000 American troops, to remain in the country after the NATO combat mission ends in December.

Ghani is reportedly close to allowing U.S. special operations forces to resume nighttime raids in pursuit of Taliban suspects, a practice that his predecessor, Hamid Karzai, banned as an intrusion into civilian homes.

Although the security pact ratified Thursday does not explicitly address night raids, U.S. officials say it would allow for continued joint U.S.-Afghan counterterrorism operations.

“Ratification enables the U.S. and Afghanistan to continue our close cooperation in the shared pursuit of security and stability for Afghanistan,” U.S. Ambassador James B. Cunningham said in a written statement.

In the northern province of Kunduz, where the Taliban has taken control of several districts in recent months, insurgents kidnapped 15 government officials late Wednesday, according to local officials.