Two more storks have been killed, this time at Maghtab, BirdLife said in a statement.
The ALE unit of the police force collected the two storks near Magħtab on Sunday evening.
The birds were taken quickly to the vet, but they died, with the vet confirming that they died of their wounds.
The original flock of 18 White Storks that arrived last Friday, now numbers 7 as possibly other birds have gone missing due to illegal hunting.
Parliamentary Secretary Clint Camilleri said on Facebook that a man has been arrested in connection with the latest incident.
On Monday, the courts denied bail to a man accused of shooting down four white storks that were part of a group of 18 that visited Malta last Friday.
James Magri, aged 41 and a resident of Dingli, pleaded not guilty to the charges of killing protected birds.