NEW : Obama promises to ensure companies do n't take advantage of gas dollars . There is no current evidence of illegal conduct , Attorney General Obama says . ` ` We will be vigilant in monitoring the oil and gas markets , '' he says . He notes there are ` ` lawful reasons '' for increases in gasoline prices .
NEW : Obama promises to ensure companies do n't take advantage of U.S. consumers . There is no current evidence of illegal conduct , Attorney General Holder says . `` We will be vigilant in monitoring the oil and gas markets , '' he says . He notes there are `` lawful reasons '' for increases in gasoline prices .