Islamabad, Pakistan (CNN) -- Heavy downpours worsened massive flooding in Pakistan on Sunday as aid agencies increased relief efforts to help the about 12 million people affected in much of the country.
The flooding, which started in the northwest, threatened places as far south as the port city of Karachi.
Peter Kessler, a spokesman, for the United Nations High Commissioner for Refugees, called the situation "catastrophic".
"There are whole families just sitting and camping in the road median strips, people just lined along the streets anywhere they can get safely while there is a very real sense of nervousness that worse may be coming," Kessler said.
Districts in the southern province of Sindh were on high alert as more rain swelled bloated rivers and inundated drenched earth. CNN
