Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Kuala Lumpur, Malaysia (CNN) Seven suspects -- all of them younger than 19 -- have been arrested in connection with a fire at a school in Malaysia's capital that claimed the lives of 21 students and two adults, state-run media outlet Bernama reported Saturday. The suspects, who range in age from 11 to 18, were "school leavers and dropouts," Kuala Lumpur Police Chief Datuk Amar Singh Ishar Singh said Saturday during a news conference. They were arrested by Royal Malaysian Police, Bernama reported. The investigation into the fire's cause continues, Singh said. Witnesses reported being awoken Thursday by cries for help from inside the burning building, where children appeared trapped by metal window grills.Suspects, ages 11 to 18, were "school leavers and dropouts," police chief saidDNA tests may be needed to identify badly burned victims, another police official said 
 Question:Asked about younger victims, he said _ testing would be required.

DNA