The Kazakh Prosecutor-General's Office has announced that a group of suspected religious extremists has been arrested in the northwestern city of Oral.
Turkmen authorities have closed the Turkmen-Kazakh border, citing the presidential elections due to be held in Turkmenistan on February 12.
Deals worth 3 billion euros have been signed during a two-day visit to Germany by Kazakh President Nursultan Nazarbaev.
Kyrgyz Prime Minister Omurbek Babanov has announced in parliament that he is ready to resign if his alleged involvement in the purchase of almost 9,000 tons of radioactive coal from neighboring Kazakhstan is proven.
Nazarbaev is on a two-day trip to Germany, during which deals worth more than $2 billion are expected to be signed.
Leaders of Kazakhstan's unregistered opposition Algha (Forward) party have been summoned to face the National Security Committee.
Kazakhstan's President Nursultan Nazarbaev is beginning a two-day official visit to Germany, where Kazakhstan is expected to agree to trade and economic cooperation deals worth over $2 billion.
Former Kazakh state customs head Serik Baimaganbetov has been arrested on charges of abuse of office and large-scale bribery.
A fifth Kazakh activist has been charged with "inciting social hatred" in southwestern town of Zhanaozen, where at least 16 people were killed in clashes between police and protesting oil workers in mid-December.
Kazakh police interrogated the deputy editor of an opposition newspaper and raided its offices in Almaty over her support for an arrested journalist.
Kazakhstan's leading carrier, Air Astana, says it has placed orders for 15 new planes worth more than $1 billion.
The prominent Kazakh human rights activist Yevgeny Zhovtis has been granted an amnesty after serving more than half of a four-year jail sentence for manslaughter.