UK's Tullow Oil rises as first-half free cash flow turns positive
** Shares of Tullow Oil TLW.L up 2.3% at 22p
** The West Africa-focused independent oil and gas explorer reports first-half free cash flow of $4 million, compared with negative $188 million a year earlier
** Tullow reiterates full-year production outlook to be at the top end of its forecast range of 34 kboepd to 42 kboepd
** As of last close, Tullow stock up ~256.2%