BEIJING — China has seized a total of 5.63 metric tons of drugs along its borders in the first half of this year, the National Immigration Administration said on July 30.

A total of 8,419 criminal cases were handled during the period, leading to the arrests of more than 21,000 criminal suspects, the administration said.

It seized 352.25 tons of precursor chemicals and confiscated 1,430 guns of all kinds.

The administration has strengthened its crackdown on drug-related crimes, safeguarded people's lives and properties, and maintained stability in border areas.