They are. In fact the Sudanese intelligence service and even the government are cooperating with Eritrea.They are deporting people before they are even screened by UNHCR at the border. Yes, they are very angry. Also, because they are angry now that people are leaving, they are involved in human trafficking. Their own intelligence service is kidnapping people, transporting them all the way to Sinai, and asking up to $33,000 ransom per person. They say, “Okay, go, but we'll catch you”. The Eritrean people are selling their homes and jewellery, and they are begging their relatives in the diaspora to pay this ransom. So yes, they are getting very vicious.
On February 14th, 2012. See this statement in context.