A newborn boy still attached to his umbilical cord was found dead in a toilet Wednesday in the lavatory of an Internet cafe in Shibuya Ward, Tokyo, and his mother was later arrested on suspicion of abandoning the baby, police said.

Mizuho Nagasue, 23, told police she had been at the cafe since Tuesday night. She never returned to her family after she left home in March, according to the police.

A spokesman of the Metropolitan Police Department said the cafe, located in the Udagawa district of Shibuya, placed an emergency call to police around 5 p.m. Officers responding to the call found Nagasue feeling sick at the cafe. She was taken to a hospital.

The suspect later admitted to giving birth to the baby and leaving him, the police said.