The sit-in at Sanaa University was one of at least five protests on Tuesday in Yemen . NEW : Yemen 's president calls for a new government to oversee parliamentary elections . NEW : The UN says it is investigating reports of mass killings in the country, and that at least 10,000 people have been killed since protests began last month against President Ali Abdullah Saleh. Protesters return to the streets , some carrying photos of the two people who died Tuesday . `` We have nothing to lose , '' says a demonstrator .
NEW : Yemen 's president calls for a new government to oversee parliamentary elections . NEW : The UN says it is investigating reports of mass killings in the country, and that at least 10,000 people have been killed since protests began last month against President Ali Abdullah Saleh. Protesters return to the streets , some carrying photos of the two people who died Tuesday . `` We have nothing to lose , '' says a demonstrator .