Authorities on Wednesday sent additional police force to Puttaparthi town in Andhra Pradesh as the condition of spiritual leader Sathya Sai Baba deteriorated.

Sai Baba, seen as the incarnation of god by his devotees, continues to be critical, his doctors said on Wednesday evening.

His blood pressure is low and the heart beat has slowed down, indicating deterioration in his vital health parameters, the doctors said.