MIDEAST STOCKS-Saudi slides on weak petrochemicals

DUBAI, June 30 (Reuters) - Saudi Arabia's stock market continued falling in early trade on Tuesday, led by petrochemicals, which sagged as the Greek debt crisis weighed on oil prices. The main Saudi stock index slid 1.3 percent, heading for its third straight daily fall, as the biggest petrochemical producer, Saudi Basic Industries, dropped 1.4 percent. Miner Ma'aden, another blue chip which has been hit hard in the market's retreat, fell 1.5 percent. But Saudi Ground Services, which listed last