Four people were killed and nearly 57 injured in two separate bomb attacks on buses ferrying naval personnel to work in Karachi on Tuesday. All four killed, including a lady doctor, were naval employees and 50 of the injured also worked for the Pakistan Navy.

The two blasts took place in quick succession; the first in the upmarket Defence Housing Area and the second in the Baldia Town neighbourhood. The bombs were planted along the regular routes of the buses and detonated by remote control. While the first bomb was packed into a motorcycle, the second was thrown into a garbage dump.

No terrorist organisation had claimed responsibility for the two blasts till evening.