DENPASAR: Indonesian police were Thursday conducting mental health checks on an American teenager suspected of killing her mother and stuffing her battered body into a suitcase on the resort island of Bali.

Heather Mack, 19, broke down in tears during questioning and claimed three men had sought to rob her and her mother in the luxury hotel where they were staying shortly before the death, police said.

However police said Mack and her boyfriend, 21-year-old Tommy Schaefer, who have both been arrested in connection with the gruesome killing, had now been officially named suspects and insisted there was strong evidence against the pair.

The half-naked body of Sheila von Wiese Mack, 62, was found Tuesday stuffed into a suitcase in the boot of a taxi in front of the five-star St. Regis hotel in the upscale Nusa Dua resort area of Bali.

A doctor said the victim had wounds to her head and appeared to have put up a struggle. The suitcase containing her body was smeared with blood, and wrapped in a bed sheet.