UPDATE: Behaviour Interactive confirms layoffs as "demand for mobile and casual external development projects has declined." Image credit: Behaviour Interactive UPDATE 4.36pm : A spokesperson for Behaviour Interactive has provided a statement to Game Developer, confirming the layoffs and offering an explanation. The statement reads: "A portion of Behaviour Interactive's business has traditionally focused on external development partnerships. In recent months, demand for mobile and casual external development projects has declined." "As we conclude our remaining engagements and do not foresee comparable opportunities in the near term, we have made the decision to part ways with some colleagues. Those decisions are never easy, and we are grateful for the contributions of the affected employees, who have helped shape Behaviour and support our partners over the years." ORIGINAL STORY 1.17pm : Behaviour Interactive appears to have laid off a number of employees.…