The victim was driving a lorry when he was shot
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Police officers have been searching a number of houses in east Belfast as part of their investigation into the murder of Jameson Lockhart.
The 25-year-old from north Belfast was shot as he sat in a lorry on the lower Newtownards Road last Friday.
The searches have been taking place in the nearby Dee Street area.
Two men arrested on Monday in connection with the shooting are still being questioning.
Mr Lockhart and another man had been clearing rubble from the site of the now-demolished Avenue One bar when the attack happened.
The other man escaped without injury.
It is believed that Mr Lockhart's business had previously been targeted several times.