NAIROBI, Kenya (AFP) — A Kenyan rights group said on Thursday it had filed a court petition against plans to establish an Ebola quarantine centre for United States (US) citizens in the east African country. Washington is building a "state-of-the-art" facility in Kenya for US citizens to quarantine after leaving the Democratic Republic of Congo, which is battling a major outbreak of the disease, a US administration official said. Katiba Institute, a Kenyan rights group, said it had filed the petition seeking to halt operations at the facility and block the entry of people exposed to Ebola.