A key town in South Waziristan lost contact with rest of the country after suspected militants blew up a telephone exchange in Shakai Valley, security officials said on Wednesday. It comes two days after a similar attack on a radio transmission in Wana took Radio Pakistan off the air. "A telephone exchange of 600 lines was hit in Shakai Valley at 7:30pm on Tuesday when a bomb went off damaging its satellite dish and boosters," the officials told Daily Times wishing not to be named.They said anti-government elements, a reference to Al Qaeda and Taliban-linked militants, were behind the attack and the aim was to disrupt government communication lines in Waziristan.