ALOR SETAR: Kedah police chief Senior Deputy Comm Datuk Ahmad Ibrahim said the post-mortem on Norsyafika Nadia Rusdi, 14, showed that she had drowned.
He said there were no bruises or injuries on her body to indicate that she could have been abused physically.
SDC Ahmad said police were baffled over how she was only clad in her bra when the body was found, adding that a T-shirt believed to belong to her was found nearby.
He added that police also found a pair of dark pants near where the bodies of her two sisters Nur Izzati Husna Rusdi, 12, and Puteri Nurul Akma Rusdi, three, were found in a canal.
"Although Norsyafika was found to have drowned, we are investigating her death and the deaths of her sisters under Section 302 of the Penal Code.
"We will look into all possibilities in the case and interview her relatives, friends and those who last saw them," he told reporters yesterday.
On the motorcycle ridden by Norsyafika on which her sisters were also seen riding pillion, he said it was found locked and in good condition at a bus stop near Sek Keb Gelam.