MAIDAN SHAHR, Afghanistan — A suicide bomber drove a truck to the heart of a provincial capital in Afghanistan on Friday and exploded his bomb, leveling many government and security buildings, badly damaging a prison, and leaving the governor without an office.

The bomber struck in Maidan Shahr, in Wardak Province, killing two police officers and a young woman and wounding 90 others, including police officers and civilians, officials said. Although the province has long been sharply contested, this was the first such attack on Maidan Shahr, about an hour’s drive from the capital, Kabul, residents said.