Afghanistan's President Hamid Karzai has strongly condemned that bomb attacks by terrorists in the Boston city of the United States, which reportedly left three people dead and over 140 others injured, a statement released by Karzai's office said Tuesday.

"President Hamid Karzai expressed grief over the civilian casualties caused by two bomb explosions in the Boston city of America,"the statement said.

Denouncing the terrorist attacks in the strongest possible terms, President Karzai said in the statement"Having suffered from terrorist attacks and civilian casualties for years, our people feel better the pain and suffering arising from such incidents".

The president also offered condolences and expressed sympathies to the families of the victims and the people of the United States, the statement added.