SEOUL, South Korea — South Korea on Tuesday rejected Boeing Co.'s bid to supply 60 fighter jets in the country's largest-ever weapons purchase even though it was the sole remaining bidder, and said it would reopen the tender.

Boeing had offered its F-15 Silent Eagle, but South Korean critics have said the warplane lacks state-of-the-art stealth capabilities and cannot effectively cope with North Korea's increasing nuclear threats.

Defense Ministry spokesman Kim Min-seok said officials decided at a meeting Tuesday to delay naming a winning bidder for the 8.3 trillion won ($7.7 billion) purchase, and would restart the bidding process at an early date.