KABUL, Afghanistan — President Hamid Karzai paid an emotional visit on Wednesday to a hospital full of survivors of a series of suicide bombings claimed by a Pakistani extremist group, and he promised to pursue the issue with Pakistan’s government.

Mr. Karzai, however, stopped short of accusing Pakistan of involvement in the suicide attacks, which killed about 60 people — including at least a few infants — and wounded more than 200, most of them in Kabul. One of the dead in Kabul was an American man, according to the Public Health Ministry. The American Embassy confirmed that, but it declined to identify the victim.

On Tuesday, the militant group Lashkar-e-Jhangvi claimed responsibility for the three bombings, in Kabul, Mazar-i-Sharif and Kandahar. All were directed against Shiite worshipers on the holiest day in their calendar, commemorating the death in 680 of Imam Hussein, the grandson of the Prophet Muhammad.

The group has mounted many sectarian attacks against Shiites in Pakistan, and has ties to the Taliban and Al Qaeda. Many experts also say it has ties to the Pakistani government’s top spy agency, Inter-Services Intelligence, or ISI.