The two girls - who sources said were lovers - jumped off a 23-story Shau Kei Wan building after school on Wednesday. The school said both of them were behaving normally that morning.

Vice principal Ho and assistant principal Lai yesterday said the parents of the two girls had sought help from the school after in-person classes resumed this month and social workers had been following up on their cases.

Ho and Lai said the school immediately discussed a contingency plan with an education psychologist to help other students after the suicides.

But they did not disclose the reason the parents of the two girls sought help from the school as the incident is currently under investigation.

"We will now put our utmost effort into providing emotional support to students. I hope we can get through this first," Lai said.

In a statement, the school said all teachers and students are saddened by the incident and issued a letter to parents asking them to pay attention to their children's emotions and provide good care.

The two girls, aged 16 and 13, plunged to their deaths from a residential building on Wednesday.

Both girls were certified dead at the scene and police officers found a suicide note on the rooftop from where they jumped.