After reducing output in May to 9.8 million bpd from April's 30-year highs of 10.1 million bpd, the world's largest oil exporter raised production again in June.

In addition to the 10.1 million bpd pumped from Saudi fields, the kingdom topped supplies up with about 200,000 bpd from storage last month, the source said.

Internal demand for Saudi crude rises sharply in the hot summer months from June to August. Export volumes were not available.