Shona Powell: Woodend-Sefton Community Board Chair has 'no idea' what caused mysterious booming this morning - Heather du Plessis-Allan Drive

A mysterious booming sound shocked North Canterbury residents this morning.

The incident happened just before 9am, with many residents saying there was a 'shockwave' following the noise.

Woodend-Sefton Community Board Chair Shona Powell has 'no idea' what caused the mysterious explosion.

She says there are a lot of theories out there, ranging from gas explosion, meth lab explosion or construction accident.

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