Tripoli, Libya (CNN) -- Forces loyal to Libyan leader Moammar Gadhafi went on the attack Tuesday, pushing opposition fighters back to the outskirts of a key oil town, rebels said. Also Tuesday, world diplomats met in London to discuss the future of the North African nation. Opposition fighters in Bin Jawad battled Gadhafi forces and came under a hail of artillery and rocket attacks, a rebel source said. CNN saw rebel fighters streaming back out of the city, beating what looked to be a hasty retreat. One said the barrage was too much for the opposition to withstand, and that Gadhafi loyalists had infiltrated Bin Jawad.
@highlight
NEW: President Obama does not rule out the option of arming rebel fighters
@highlight
Opposition fighters retreat from Bin Jawad, regroup in Ras Lanuf
@highlight
Libyan government says military and civilian locations were bombed in Tripoli
@highlight
Libyan forces pound Misrata, a witness with the opposition says
Elsewhere in Libya, three loud explosions were heard in @placeholder.