At least three people have been killed in a suicide bombing that hit a US consular vehicle in Pakistan’s northwestern city of Peshawar.Two Americans working for the US consulate were wounded in Monday’s bomb attack on their vehicle, the American embassy said.The blast also wounded two Pakistani employees of the consulate, the embassy in Islamabad said in a statement.Earlier, Mian Iftikhar Hussain, regional information minister, said at least four people, including two Americans, were killed by a vehicle-borne suicide bomber.A policeman told Associated Press news agency that an explosive-filled car struck the US government vehicle after it had left the consulate. Seventeen more people were reportedly injured in the attack.The identities of those killed remains unclear."We can confirm that a vehicle belonging to the US consulate in Peshawar was hit in an apparent terrorist attack,” the US embassy statement said. "Two US personnel and two Pakistani staff of the consulate were injured and are receiving medical treatment.”Al Jazeera’s Imtiaz Tyab, reporting from Islamabad, said: "What we are hearing is that three people are dead, and a number of people are wounded after a vehicle slammed into a US consulate vehicle.”There is "some suggestion that those who are injured are foreign nationals”, he said, adding that there are "conflicting reports as to who exactly was targeted in this attack”.The blast took place near residential quarters for the US consulate and foreign aid organisations, Tahir Ayub, a senior police officer, told AFP news agency.