fragile relations between islamabad and washington, kyra. >> ressa, thanks. >>> in syria, an activist tells cnn the government's crackdown on protesters has left streets littered with dead bodies and wounded. that video posted online supposedly shows troops opening fire on demonstrators in the capital. in recent weeks, hundreds of people have reportedly been killed, and now the united nations is stepping in. zain verjee is following this for us from london. what is going to happen this week? >> well, what we are hearing from opposition groups, first of all, is that they are saying that 64 people were killed in syria just on sunday. there's a huge amount of political pressure from the united nations on syria, as well as the arab league. now the arab league is saying they are leaving. there's too much violence, and they are pulling out their monitoring mission, which was supposed to protect people from more violence. there have been more clashes today in different suburbs