However, the tone at the memorial was not all conciliatory. Speaking after Karzai, Rabbani's son lashed out at the Afghan government, accusing it of not doing enough to bring his father's murderers and those of other politicians to justice.
"People have the right to know who the people are behind these series of killings and why," Salahuddin Rabbani said. "Unfortunately, the government has failed in its investigations."
In the first of three attacks Wednesday, a bomb hidden in a parked motorcycle exploded outside a police training center in western Afghanistan, killing two security guards, said Herat provincial police spokesman, Noor Khan Nikzad. He said six guards were also wounded in the explosion.
No one immediately claimed responsibility for the attack, but it matched the pattern of Taliban strikes that typically target Afghan forces or government workers.
Then in the early evening, bombs went off in the two main southern cities of Kandahar and Lashkar Gah. The bomb in Kandahar went off near a police checkpoint, killing two police officers and one civilian, said provincial government spokesman Jawed Faisel. Then a gunman in Lashkar Gah to the west fired on police on motorcycles, killing another two officers and one civilian, said Helmand provincial spokesman Daoud Ahmadi.
Associated Press writers Rahim Faiez in Kabul and Slobodan Lekic in Brussels contributed to this report.