Anna Lo said: “This seems to be a very sinister situation. It appears someone started this fire deliberately – this caused the gas leak and could have caused untold carnage.
“It’s a miracle that no-one was hurt and that the bridge was not extensively damaged.
“My thoughts are with the people evacuated from their homes through the night as this has been a disgraceful disruption for them.
“People need answers on exactly how this started and we need a full investigation to catch the culprits, if this was deliberate.
“It’s astounding think that anyone would be foolish and thoughtless enough to light a fire under a gas pipeline.”