Police officers investigating the murder of Daphne Caruana Galizia have seized a cabin cruiser from which, they suspect, the car bomb was detonated.

Investigators believe that the bomb was triggered by an SMS sent to a phone that formed part of the explosive device.

They believe that one of the accused was acting as a spotter in Bidnija, but the SMS that detonated the bomb was sent from a vessel that was out at sea.

It is believed that the vessel is the one seen in footage of the police and army operation that was released on Monday evening (above).

It is understood that investigators came to these conclusions after using triangulation techniques with the help of foreign investigators, more specifically the FBI.

It is being reported that George Degiorgio, known as Ic-Ciniz, sent the SMS and that his brother Alfred, known as il-Fulu, was acting as his spotter. The two men, along with Vince Muscat, known as il-Kohhu, were charged over the murder on Tuesday night. They pleaded not guilty but did not make a request for bail.

It is believed that Muscat was acting as a lookout from another vantage point.

Investigators are now believed to be looking for clues on the vessel, including GPS data.