HOUSTON (AP) -

An old concrete-lined safe that was drilled open after the owner died has yielded a possible treasure trove of apparent gold coins.
    
Houston police spokesman Kese Smith on Wednesday had no estimated value but says the coins likely involve a "substantial" amount.
    
Locksmith Robert Rivera said a customer planning to sell the safe for scrap wondered about the contents. Rivera on Monday helped open the safe, then contacted police. Officers took temporary custody of the coins until parties in the civil matter reached an undisclosed agreement Tuesday.
    
KTRK-TV reports an attorney said relatives of the late owner, whose name wasn't released, gave an individual the safe while clearing the home but said any valuables found were to be returned.
    
KPRC-TV reported the safe also had silver bars and jewelry.