Updated

A news report says North Korea now has more multiple-launch rockets capable of hitting Seoul.

Yonhap news agency says North Korea has increased its arsenal of rockets by 100 pieces to about 5,200. Yonhap cited an unidentified South Korean military source.

The agency says the rockets have a range of 37 miles (60 kilometers), putting Seoul within striking distance.

Yonhap said in Friday's report that North Korea was also believed to have deployed surface-to-air SA-2 missiles and SA-5 missiles near the border.

The South Korean Joint Chiefs of Staff said it could not confirm the report because it involves military intelligence.

The report comes a week after a North Korean artillery attack on a South Korean island killed four people.