one of his sons still at large, is sending e-mails to our nic robertson. nic just got another one a few minutes ago and he joins us shortly. in the meantime, heavy fighting today in tripoli. take a look. street battles all day. this is from the capital's eastern neighborhoods not far from the airport. the field in opposition still taking heavy shelling from nearby loyalists. in the last hour or two, the two sides have exchanged artillery throughout the day. opposition commanders have been trying to direct fire to minimize civilian casualties. gadhafi forces are intertwined amongst the population. in southern tripoli, similar disdain for civilian lives. taking pot shots at people. to the east, new video of the damage that loyalist fighters