14h50

The Al Arabiya news station tweeted:

@AlArabiya_Eng #Gaddafi forces open fire on protesters in several areas of capital: witnesses #Libya #alarabiya

While the two-time Pulitzer prize winning journalist Nick Kristof posted:

@NickKristof Lots of accounts now that #Qaddafi forces opened fire 30" ago on protesters in Tripoli, #Libya. Toll uncertain.

The Libyan Youth Movement is filing similar reports on Twitter.

@ShababLibya BREAKING: Confirmed: Gun shots now fired, mass protesters headed to martyrs square, women also part of the protests #Libya #Feb17