Police Scotland is carrying out inquiries following a series of fires at telecommunications sites in Glasgow.
A fibre underground chamber in Threestone Hill and a copper cabling underground chamber in Croftspar Drive at Springboig Avenue were damaged, after someone deliberately set fires.
The first incident happened between midnight on Thursday and 1am on Friday.
The chamber at Croftspar Drive was then set alight again between 2am on Friday and 8am on Saturday.
Detective Sergeant Lisa MacDonald said: “We believe these incidents are linked.
“Neither of these chambers are 5G sites. Not only is fire-raising dangerous, this has caused severe disruption to several hundred businesses and home customers, who during these challenging times will be relying on virtual technology and the phone to keep in contact with customers, family and friends.
“Anyone who knows who is responsible, should call Police Scotland on 101 quoting 0726 of April 24.”