This was the third attack on the Navy in less than a week.
According to Pakistan Navy Commander Spokesman Salman and Superintendent Police (SP) Umer Khatab, a Pakistan Navy Mehran bus was targeted with a remote-controlled blast in Karsaz area at Faisal highway.
SSP Umer Khatab told newsmen that the attack was carried out in a similar fashion as two attacks on two naval buses were carried out on Tuesday.
Spokesman Pakistan Navy Commander Salman in a statement said four Pakistan navy sailors and a passer-by were killed in the explosion and seven PN personnel were wounded.
However, hospital sources said that nearly 18 wounded people have been admitted in different hospitals.
The Pakistan Navy Personnel who were killed in the blast included Mohammad Ramzan, Muhammad Yameen, Imtiaz Ahmed and a lady doctor Sabba Marwat.
Two other vehicles traveling on the road were also destroyed in the blast. Windowpanes of many nearby houses were also damaged with the intensity of the blast.
DIG investigation Iftikhar Tarrar told media men that 3 KG explosive material was used in the blast. He said the blast appeared to be the work of the same group behind twin bombings on Tuesday.
It merits mentioning here that Baloch Liberation Front (BLF) has claimed the responsibility for earlier twin bomb attacks on Pakistan Navy buses killing four people.
President Asif Ali Zardari and Prime Minister Syed Yusuf Raza Gilani have strongly condemned the bomb blast in Karachi on the Pakistan Navy bus that caused loss of lives and injuries to many.
In a separate statement, the President said the government and people of Pakistan were determined to defeat terrorism and such gruesome acts cannot deter the resolve of the nation that remains united to defeat terrorists.
The President also sought a report from the law enforcement agencies about the incident and directed them to ensure that such acts do not recur.
The President in a message to the families conveyed his deep sorrow and grief over loss of lives in the dastardly terrorist act. He also asked the provincial government for measures to take care of the injured.
The Prime Minister in his statement said such cowardly acts of terror, could not deter the resolve of the nation and armed forces to curb the menace of militancy and extremism from society.
The Prime Minister directed the concerned investigating agencies to probe into the incident and submit a report so that further course of action could be taken.
Defence Minister Chaudhry Ahmed Mukhtar also condemned attacks on Navy buse in Karachi and said terrorists wanted to destabalize the country by creating atmosphere of fear and terror but they would not succeed in their nefarious designs.
The minister said elements involved in this cowardly act would be brought to justice. He said such acts of terrorism cannot dent the government’s resolve to fight the menace of terrorism and militancy to the end.
Chairman Senate Farooq H Naek, Deputy Chairman Senate Jan Muhammad Jamali,
Chief Minister Syed Qiam Ali Shah, Chief Minister Punjab Mian Shahbaz Sharif, Chief MQM Altaf Hussain, Chairman PTI Imran Khan, President PML-Q Chaudhry Shujjat Hussain have also condemned the bomb blast.